(x + 5)(x - 5) =?
Hel

x = +-5

Step-by-step explanation:

Using the FOIL method, multiply x of the first parentheses to the x of the second and to the -5 of the second. Then multiply +5 of the first parentheses to the x of the second and to the -5 of the second. That should give you x^2 - 25 = 0. Next add 25 to both sides, to give you x^2=25. Next, take the square root of the problem to give you x= +-5.

the solution is h=10 because you add 9 to each side of the equation.