Mathematics · Quantitative Aptitude

Algebraic Equations and Expressions

152 Questions

Algebraic equations and expressions test mathematical skills in solving for unknown variables. Questions involve linear equations, ratios, and evaluating complex expressions. This topic forms a core component of quantitative aptitude sections in various competitive exams.

Linear equationsEvaluating expressionsRatio proportionsExponential equationsHypergeometric functions

Algebraic Equations and Expressions Questions

Multiple choice

What is the value of x in the equation 3x + 5 = 17?

  1. 4

  2. 5

  3. 6

  4. 7

Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

To solve for x, we need to isolate x on one side of the equation. We can do this by subtracting 5 from both sides of the equation: 3x + 5 - 5 = 17 - 5. This simplifies to 3x = 12. Then, we divide both sides of the equation by 3: 3x / 3 = 12 / 3. This simplifies to x = 4.

Multiple choice

What is the value of x in the following equation: 3x + 5 = 17?

  1. 4

  2. 5

  3. 6

  4. 7

Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

To solve for x, we can subtract 5 from both sides of the equation: 3x + 5 - 5 = 17 - 5, which simplifies to 3x = 12. Dividing both sides by 3, we get x = 4.

Multiple choice

Which of the following is not a method for solving quintic equations?

  1. Abel's method

  2. Galois' method

  3. Lagrange's method

  4. Newton's method

Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Newton's method is a numerical method for solving equations, including quintic equations. It is not a specific method for solving quintic equations like Abel's method, Galois' method, or Lagrange's method.

Multiple choice

What is the name of the equation that states that for any positive integer $n$, there exist infinitely many pairs of integers $x$ and $y$ such that $x^2 - y^2 = n$?

  1. Pell's equation

  2. Fermat's Last Theorem

  3. Goldbach's conjecture

  4. Hardy-Littlewood conjecture

Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Pell's equation is an equation that states that for any positive integer $n$, there exist infinitely many pairs of integers $x$ and $y$ such that $x^2 - y^2 = n$. It was first studied by the Indian mathematician Brahmagupta in the 7th century CE.

Multiple choice

What is the name of the equation that states that for any positive integer $n$, there exist infinitely many pairs of integers $x$ and $y$ such that $x^n - y^n = z^2$?

  1. Pell's equation

  2. Fermat's Last Theorem

  3. Goldbach's conjecture

  4. Hardy-Littlewood conjecture

Reveal answer Fill a bubble to check yourself
Correct answer
Explanation

Catalan's conjecture is an equation that states that for any positive integer $n$, there exist infinitely many pairs of integers $x$ and $y$ such that $x^n - y^n = z^2$. It was first proposed by Eugène Charles Catalan in the 19th century CE and remains unproven.

Multiple choice

What is the name of the equation that states that for any positive integer $n$, there exist infinitely many pairs of integers $x$ and $y$ such that $x^n + y^n = z^m$?

  1. Pell's equation

  2. Fermat's Last Theorem

  3. Goldbach's conjecture

  4. Hardy-Littlewood conjecture

Reveal answer Fill a bubble to check yourself
Correct answer
Explanation

Catalan's conjecture is an equation that states that for any positive integer $n$, there exist infinitely many pairs of integers $x$ and $y$ such that $x^n + y^n = z^m$. It was first proposed by Eugène Charles Catalan in the 19th century CE and remains unproven.

Multiple choice

What is the value of (x) in the equation (x^2 - 2x + 1 = 0)?

  1. \(1\)
  2. \(-1\)
  3. \(2\)
  4. \(-2\)
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Using the quadratic formula, (x = \frac{-b \pm \sqrt{b^2 - 4ac}}{2a}), we can solve for (x) in the equation (x^2 - 2x + 1 = 0). Substituting the values of (a), (b), and (c), we get (x = 1).

Multiple choice

What is the value of (x) in the equation (x^3 - 3x^2 + 3x - 1 = 0)?

  1. \(1\)
  2. \(-1\)
  3. \(2\)
  4. \(-2\)
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Using the rational root theorem, we can find that (x = 1) is a root of the equation (x^3 - 3x^2 + 3x - 1 = 0). Therefore, (x - 1) is a factor of the polynomial. Dividing the polynomial by (x - 1), we get (x^2 - 2x + 1). Solving for (x) in this quadratic equation, we get (x = 1).

Multiple choice

What is the value of (x) in the equation (x^4 - 2x^3 + x^2 - 2x + 1 = 0)?

  1. \(1\)
  2. \(-1\)
  3. \(2\)
  4. \(-2\)
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Using the rational root theorem, we can find that (x = 1) is a root of the equation (x^4 - 2x^3 + x^2 - 2x + 1 = 0). Therefore, (x - 1) is a factor of the polynomial. Dividing the polynomial by (x - 1), we get (x^3 - x^2 + 1). Solving for (x) in this cubic equation, we get (x = 1).

Multiple choice

What is the value of (x) in the equation (x^5 - 3x^4 + 3x^3 - x^2 + x - 1 = 0)?

  1. \(1\)
  2. \(-1\)
  3. \(2\)
  4. \(-2\)
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Using the rational root theorem, we can find that (x = 1) is a root of the equation (x^5 - 3x^4 + 3x^3 - x^2 + x - 1 = 0). Therefore, (x - 1) is a factor of the polynomial. Dividing the polynomial by (x - 1), we get (x^4 - 2x^3 + 2x^2 - x + 1). Solving for (x) in this quartic equation, we get (x = 1).

Multiple choice

What is the value of (x) in the equation (x^6 - 4x^5 + 6x^4 - 4x^3 + x^2 - 4x + 1 = 0)?

  1. \(1\)
  2. \(-1\)
  3. \(2\)
  4. \(-2\)
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Using the rational root theorem, we can find that (x = 1) is a root of the equation (x^6 - 4x^5 + 6x^4 - 4x^3 + x^2 - 4x + 1 = 0). Therefore, (x - 1) is a factor of the polynomial. Dividing the polynomial by (x - 1), we get (x^5 - 3x^4 + 3x^3 - x^2 + x - 1). Solving for (x) in this quintic equation, we get (x = 1).

Multiple choice

What is the value of (x) in the equation (x^7 - 5x^6 + 10x^5 - 10x^4 + 5x^3 - x^2 + x - 1 = 0)?

  1. \(1\)
  2. \(-1\)
  3. \(2\)
  4. \(-2\)
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Using the rational root theorem, we can find that (x = 1) is a root of the equation (x^7 - 5x^6 + 10x^5 - 10x^4 + 5x^3 - x^2 + x - 1 = 0). Therefore, (x - 1) is a factor of the polynomial. Dividing the polynomial by (x - 1), we get (x^6 - 4x^5 + 6x^4 - 4x^3 + x^2 - 4x + 1). Solving for (x) in this sextic equation, we get (x = 1).

Multiple choice

Who was the first mathematician to develop a method for solving sextic equations?

  1. Ludovico Ferrari

  2. Niccolò Fontana Tartaglia

  3. Gerolamo Cardano

  4. François Viète

Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Ludovico Ferrari was the first mathematician to develop a method for solving sextic equations.

Multiple choice

What is the value of the Hypergeometric function (_2F_1(1, 2; 3; x)) at x = 0?

  1. 0

  2. 1

  3. 2

  4. 3

Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The Hypergeometric function (_2F_1(1, 2; 3; x)) at x = 0 is equal to 1.

Multiple choice

What is the value of the Hypergeometric function (_2F_1(2, 3; 4; x)) at x = 1?

  1. 0

  2. 1

  3. 2

  4. 3

Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The Hypergeometric function (_2F_1(2, 3; 4; x)) at x = 1 is equal to 1.