Find the quadratic equation whose roots are x = -2 or x = 7
- x2 + 2x - 7 = 0
- x2 - 2x + 7 = 0
- x2 + 5 +14 = 0
-
x2 - 5x - 14 = 0
- x2 + 5x - 14 = 0
The correct answer is: D
Explanation
x + 2 and x - 7 are factors(x+2)(x+7) = 0
x(x-7) + 2(x-7) = 0
x2 - 7x + 2x - 14 = 0
x2 - 5x - 14 = 0