12*12-9*9=c*c

Solution for 12*12-9*9=c*c equation:

Simplifying
12 * 12 + -9 * 9 = c * c

Multiply 12 * 12
144 + -9 * 9 = c * c

Multiply -9 * 9
144 + -81 = c * c

Combine like terms: 144 + -81 = 63
63 = c * c

Multiply c * c
63 = c2

Solving
63 = c2

Solving for variable 'c'.

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

Add '-1c2' to each side of the equation.
63 + -1c2 = c2 + -1c2

Combine like terms: c2 + -1c2 = 0
63 + -1c2 = 0

Add '-63' to each side of the equation.
63 + -63 + -1c2 = 0 + -63

Combine like terms: 63 + -63 = 0
0 + -1c2 = 0 + -63
-1c2 = 0 + -63

Combine like terms: 0 + -63 = -63
-1c2 = -63

Divide each side by '-1'.
c2 = 63

Simplifying
c2 = 63

Take the square root of each side:
c = {-7.937253933, 7.937253933}