Multiple choice

Statement I: lf $\alpha,\ \beta$ are the roots of $x^{2}-ax+b=0$, then the equation whose roots are $\displaystyle \frac{\alpha+\beta}{\alpha},\ \displaystyle \frac{\alpha+\beta}{\beta}$ is $bx^{2}-a^{2}x+a^{2}=0$ Statement II: lf $\alpha,\ \beta$ are the roots of $x^{2}-bx+c=0$ and $\alpha+h,\ \beta+h$ are the roots of $x^{2}+qx+r=0$, then $\mathrm{h}=\mathrm{b}-\mathrm{q}$. Which of the above statement(s) is(are) true.

  1. only I

  2. only II

  3. both I and II

  4. neither I and II

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

Statement I: Roots are alpha, beta of x^2 - ax + b = 0. Sum = a, product = b. New roots are (a/alpha) and (a/beta). Sum = a(1/alpha + 1/beta) = a((alpha+beta)/alpha*beta) = a(a/b) = a^2/b. Product = a^2/(alpha*beta) = a^2/b. Equation: x^2 - (a^2/b)x + (a^2/b) = 0. Multiply by b: bx^2 - a^2x + a^2 = 0. Statement I is true. Statement II: Roots alpha, beta of x^2 - bx + c = 0. Sum = b, product = c. Roots alpha+h, beta+h of x^2 + qx + r = 0. Sum = alpha+beta+2h = -q. So b+2h = -q => 2h = -q-b. Statement II is false.

AI explanation

For Statement I, Vieta's formulas give alpha + beta = a, so the new roots are a/alpha and a/beta, which sum to a(alpha + beta)/(alpha*beta) = a^2/b and have a product of a^2/(alpha*beta) = a^2/b. The quadratic equation with these roots is x^2 - (a^2/b)x + a^2/b = 0, which clears to bx^2 - a^2x + a^2 = 0, making Statement I true. For Statement II, the sum of roots gives alpha + beta = b for the first equation and (alpha + h) + (beta + h) = -q for the second. Substituting b into the second equation yields b + 2h = -q, so h = (-q - b)/2, which contradicts the claim that h = b - q, making Statement II false.