(d-5)(d+5)=0

Solution for (d-5)(d+5)=0 equation:

Simplifying
(d + -5)(d + 5) = 0

Reorder the terms:
(-5 + d)(d + 5) = 0

Reorder the terms:
(-5 + d)(5 + d) = 0

Multiply (-5 + d) * (5 + d)
(-5(5 + d) + d(5 + d)) = 0
((5 * -5 + d * -5) + d(5 + d)) = 0
((-25 + -5d) + d(5 + d)) = 0
(-25 + -5d + (5 * d + d * d)) = 0
(-25 + -5d + (5d + d2)) = 0

Combine like terms: -5d + 5d = 0
(-25 + 0 + d2) = 0
(-25 + d2) = 0

Solving
-25 + d2 = 0

Solving for variable 'd'.

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

Add '25' to each side of the equation.
-25 + 25 + d2 = 0 + 25

Combine like terms: -25 + 25 = 0
0 + d2 = 0 + 25
d2 = 0 + 25

Combine like terms: 0 + 25 = 25
d2 = 25

Simplifying
d2 = 25

Take the square root of each side:
d = {-5, 5}