Question

Factor x2 + 10x – 18.

a. (x – 2)(x – 9)


b. (x + 3)(x – 6)


c. (x – 2)(x + 5)


d. prime

please explain.

Answer 1

x² + 10x – 18

Find factors of x² and -18 that will give you 10x when added

x² + 10x – 18

this is a prime, because there are no factors of -18 (-9 and 2 with negative interchangeably, and -6 and 3, with negative interchangeably) that will give you 10.

Therefore, you're answer is D. prime


hope this helps