Multiple choice

If the roots of the equation $x^{2} + px + c = 0$ are $(2, -2)$ and the roots of the equation $x^{2} + bx + q = 0$ are $(-1, -2)$, then the roots of the equation $x^{2} + bx + c = 0$ are

  1. $-3, -2$
  2. $-3, 2$
  3. $1, -4$
  4. $-5, 1$
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C Correct answer
Explanation

For x^2 + px + c = 0, roots are 2, -2, so c = product = -4. For x^2 + bx + q = 0, roots are -1, -2, so b = -(sum) = 3. The equation x^2 + bx + c = 0 becomes x^2 + 3x - 4 = 0. Factoring gives (x+4)(x-1) = 0, so roots are -4, 1.

AI explanation

For the first equation x^2 + px + c = 0 with roots 2 and -2, the constant c is the product of its roots, so c = (2)(-2) = -4. For the second equation x^2 + bx + q = 0 with roots -1 and -2, the coefficient b is the negative sum of its roots, so b = -(-1 - 2) = 3. The new equation is x^2 + 3x - 4 = 0, which factors as (x + 4)(x - 1) = 0, yielding roots of 1 and -4.