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2 and -3 are the roots of?

A. (x−2)(x+3)=0
B. (x−3)(x−4)=0
C. (x+2)(x+3)=0
D. (x−2)(x−3)=0
Correct Answer: A. (x−2)(x+3)=0

To find the quadratic equation from its roots, we use the principle that if 'a' and 'b' are the roots, then the equation can be written as (x - a)(x - b) = 0. Given the roots are 2 and -3, we substitute these values into the formula.

  • For the root 2, the factor is (x - 2).
  • For the root -3, the factor is (x - (-3)), which simplifies to (x + 3).

Therefore, the correct equation is (x - 2)(x + 3) = 0, making option A accurate. The other options would yield different roots:

  • Option B, (x - 3)(x - 4) = 0, has roots 3 and 4.
  • Option C, (x + 2)(x + 3) = 0, has roots -2 and -3.
  • Option D, (x - 2)(x - 3) = 0, has roots 2 and 3.

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