15d^2+0d-15=0

Solution for 15d^2+0d-15=0 equation:

Simplifying
15d2 + 0d + -15 = 0

Anything times zero is zero.
15d2 + 0d + -15 = 0

Reorder the terms:
0 + -15 + 15d2 = 0

Combine like terms: 0 + -15 = -15
-15 + 15d2 = 0

Solving
-15 + 15d2 = 0

Solving for variable 'd'.

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

Add '15' to each side of the equation.
-15 + 15 + 15d2 = 0 + 15

Combine like terms: -15 + 15 = 0
0 + 15d2 = 0 + 15
15d2 = 0 + 15

Combine like terms: 0 + 15 = 15
15d2 = 15

Divide each side by '15'.
d2 = 1

Simplifying
d2 = 1

Take the square root of each side:
d = {-1, 1}