What is x if x squared plus x equals 56?

Answer 1

7 or -8

72+7 = 56

(-8)2+(-8) = 56

You can solve this using some simple algebra.

Let x be the number you are looking for.

x2 +x-56-0

This can be factored as:

(x-7)(x+8)=0

Now use the zero property that says if AB=0, A=0 or B=0 (or both)

So x-7=0 and x=7 or

x+8=0 and x=-8