(d+3)(d-3)=

Solution for (d+3)(d-3)= equation:

Simplifying
(d + 3)(d + -3) = 0

Reorder the terms:
(3 + d)(d + -3) = 0

Reorder the terms:
(3 + d)(-3 + d) = 0

Multiply (3 + d) * (-3 + d)
(3(-3 + d) + d(-3 + d)) = 0
((-3 * 3 + d * 3) + d(-3 + d)) = 0
((-9 + 3d) + d(-3 + d)) = 0
(-9 + 3d + (-3 * d + d * d)) = 0
(-9 + 3d + (-3d + d2)) = 0

Combine like terms: 3d + -3d = 0
(-9 + 0 + d2) = 0
(-9 + d2) = 0

Solving
-9 + d2 = 0

Solving for variable 'd'.

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

Add '9' to each side of the equation.
-9 + 9 + d2 = 0 + 9

Combine like terms: -9 + 9 = 0
0 + d2 = 0 + 9
d2 = 0 + 9

Combine like terms: 0 + 9 = 9
d2 = 9

Simplifying
d2 = 9

Take the square root of each side:
d = {-3, 3}