(a*a)-87=-6

Solution for (a*a)-87=-6 equation:

Simplifying
(a * a) + -87 = -6

Multiply a * a
(a2) + -87 = -6
a2 + -87 = -6

Reorder the terms:
-87 + a2 = -6

Solving
-87 + a2 = -6

Solving for variable 'a'.

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

Add '87' to each side of the equation.
-87 + 87 + a2 = -6 + 87

Combine like terms: -87 + 87 = 0
0 + a2 = -6 + 87
a2 = -6 + 87

Combine like terms: -6 + 87 = 81
a2 = 81

Simplifying
a2 = 81

Take the square root of each side:
a = {-9, 9}