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
What is the value of x in the equation 3x + 5 = 17?
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.
What is the value of x in the following equation: 3x + 5 = 17?
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.
Which of the following is not a method for solving quintic equations?
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Abel's method
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Galois' method
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Lagrange's method
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Newton's method
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.
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 $x^2 - y^2 = n$?
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Pell's equation
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Fermat's Last Theorem
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Goldbach's conjecture
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Hardy-Littlewood conjecture
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.
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 $x^n - y^n = z^2$?
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Pell's equation
-
Fermat's Last Theorem
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Goldbach's conjecture
-
Hardy-Littlewood conjecture
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.
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 $x^n + y^n = z^m$?
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Pell's equation
-
Fermat's Last Theorem
-
Goldbach's conjecture
-
Hardy-Littlewood conjecture
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.
What is the value of (x) in the equation (x^2 - 2x + 1 = 0)?
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\(1\)
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\(-1\)
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\(2\)
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\(-2\)
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).
What is the value of (x) in the equation (x^3 - 3x^2 + 3x - 1 = 0)?
-
\(1\)
-
\(-1\)
-
\(2\)
-
\(-2\)
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).
What is the value of (x) in the equation (x^4 - 2x^3 + x^2 - 2x + 1 = 0)?
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\(1\)
-
\(-1\)
-
\(2\)
-
\(-2\)
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).
What is the value of (x) in the equation (x^5 - 3x^4 + 3x^3 - x^2 + x - 1 = 0)?
-
\(1\)
-
\(-1\)
-
\(2\)
-
\(-2\)
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).
What is the value of (x) in the equation (x^6 - 4x^5 + 6x^4 - 4x^3 + x^2 - 4x + 1 = 0)?
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\(1\)
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\(-1\)
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\(2\)
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\(-2\)
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).
What is the value of (x) in the equation (x^7 - 5x^6 + 10x^5 - 10x^4 + 5x^3 - x^2 + x - 1 = 0)?
-
\(1\)
-
\(-1\)
-
\(2\)
-
\(-2\)
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).
Who was the first mathematician to develop a method for solving sextic equations?
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Ludovico Ferrari
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Niccolò Fontana Tartaglia
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Gerolamo Cardano
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François Viète
A
Correct answer
Explanation
Ludovico Ferrari was the first mathematician to develop a method for solving sextic equations.
What is the value of the Hypergeometric function (_2F_1(1, 2; 3; x)) at x = 0?
B
Correct answer
Explanation
The Hypergeometric function (_2F_1(1, 2; 3; x)) at x = 0 is equal to 1.
What is the value of the Hypergeometric function (_2F_1(2, 3; 4; x)) at x = 1?
B
Correct answer
Explanation
The Hypergeometric function (_2F_1(2, 3; 4; x)) at x = 1 is equal to 1.