(y+10)(y-10)=

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

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

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

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

Multiply (10 + y) * (-10 + y)
(10(-10 + y) + y(-10 + y)) = 0
((-10 * 10 + y * 10) + y(-10 + y)) = 0
((-100 + 10y) + y(-10 + y)) = 0
(-100 + 10y + (-10 * y + y * y)) = 0
(-100 + 10y + (-10y + y2)) = 0

Combine like terms: 10y + -10y = 0
(-100 + 0 + y2) = 0
(-100 + y2) = 0

Solving
-100 + y2 = 0

Solving for variable 'y'.

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

Add '100' to each side of the equation.
-100 + 100 + y2 = 0 + 100

Combine like terms: -100 + 100 = 0
0 + y2 = 0 + 100
y2 = 0 + 100

Combine like terms: 0 + 100 = 100
y2 = 100

Simplifying
y2 = 100

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