(A+10)(A-10)=

Solution for (A+10)(A-10)= equation:

Simplifying
(A + 10)(A + -10) = 0

Reorder the terms:
(10 + A)(A + -10) = 0

Reorder the terms:
(10 + A)(-10 + A) = 0

Multiply (10 + A) * (-10 + A)
(10(-10 + A) + A(-10 + A)) = 0
((-10 * 10 + A * 10) + A(-10 + A)) = 0
((-100 + 10A) + A(-10 + A)) = 0
(-100 + 10A + (-10 * A + A * A)) = 0
(-100 + 10A + (-10A + A2)) = 0

Combine like terms: 10A + -10A = 0
(-100 + 0 + A2) = 0
(-100 + A2) = 0

Solving
-100 + A2 = 0

Solving for variable 'A'.

Move all terms containing A to the left, all other terms to the right.

Add '100' to each side of the equation.
-100 + 100 + A2 = 0 + 100

Combine like terms: -100 + 100 = 0
0 + A2 = 0 + 100
A2 = 0 + 100

Combine like terms: 0 + 100 = 100
A2 = 100

Simplifying
A2 = 100

Take the square root of each side:
A = {-10, 10}