Question

Factor to find the zeros of the function defined by the quadratic expression. −13x^2 − 130x − 273 A) x = 7 or x = 3 B) x = 7 or x = −3 C) x = −7 or x = 3 D) x = −7 or x = −3

Answer 1

−13x^2 − 130x − 273

= -13(x^2 + 10x + 21)

= - 13(x + 3)(x + 7)

- 13(x + 3)(x + 7) = 0

x + 3 = 0; x = -3

x + 7 = 0; x = -7

Answer

D) x = −7 or x = −3

Answer 2

-13x^2 - 130x - 273 = 0

divide through by -13:-

-13( x^2 + 10x + 21) = 0

-13(x + 7)(x + 3) = 0

x = -7 or -3

Its D