(D+10)(D-10)=

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

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

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

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

Multiply (10 + D) * (-10 + D)
(10(-10 + D) + D(-10 + D)) = 0
((-10 * 10 + D * 10) + D(-10 + D)) = 0
((-100 + 10D) + D(-10 + D)) = 0
(-100 + 10D + (-10 * D + D * D)) = 0
(-100 + 10D + (-10D + D2)) = 0

Combine like terms: 10D + -10D = 0
(-100 + 0 + D2) = 0
(-100 + D2) = 0

Solving
-100 + D2 = 0

Solving for variable 'D'.

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

Add '100' to each side of the equation.
-100 + 100 + D2 = 0 + 100

Combine like terms: -100 + 100 = 0
0 + D2 = 0 + 100
D2 = 0 + 100

Combine like terms: 0 + 100 = 100
D2 = 100

Simplifying
D2 = 100

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