d^2-9=

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Solution for d^2-9= equation: 


Simplifying
d2 + -9 = 0

Reorder the terms:
-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}

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