Question

What are the solutions to the equation? x2 + 6x = 40

Answer 1

Just plug in the numbers:

4:  16 + 24 = 40  YES

5 = 25 + 40 ≠ 40 NO

8: 64 + 48 ≠ 40 NO

10: 100 + 60 ≠ 40 NO


So A. is the correct answer. Just to be sure:

-10: 100 + ( - 60) = 40 


Your answer is A. Hope that helps! :) 

Answer 2

A............................