(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}