Solve z2 - 15z + 56 = 0 using the zero product property.

A. z = - 5, - 2

B. z = 8, 7

C. z = - 4, 7

D. z = 8, - 4

Answer: B

Heyy, this is a quadratic equation and I used the null factor law to solve this. So basically, find 2 numbers that multiply together to get 56, e. g. 8x7. But you have to make sure that the 2 numbers you choose add up to 15. Then put it in null factor law form, e. g. (z-8) (z-7) = 0. Then just solve for 0. E. g. z-8=0. Which is 8. If you want, you can expand to check if it matches the original equation ... : ')