15*15-3.5*3.5=c*c

Solution for 15*15-3.5*3.5=c*c equation:

Simplifying
15 * 15 + -3.5 * 3.5 = c * c

Multiply 15 * 15
225 + -3.5 * 3.5 = c * c

Multiply -3.5 * 3.5
225 + -12.25 = c * c

Combine like terms: 225 + -12.25 = 212.75
212.75 = c * c

Multiply c * c
212.75 = c2

Solving
212.75 = 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.
212.75 + -1c2 = c2 + -1c2

Combine like terms: c2 + -1c2 = 0
212.75 + -1c2 = 0

Add '-212.75' to each side of the equation.
212.75 + -212.75 + -1c2 = 0 + -212.75

Combine like terms: 212.75 + -212.75 = 0.00
0.00 + -1c2 = 0 + -212.75
-1c2 = 0 + -212.75

Combine like terms: 0 + -212.75 = -212.75
-1c2 = -212.75

Divide each side by '-1'.
c2 = 212.75

Simplifying
c2 = 212.75

Take the square root of each side:
c = {-14.585952146, 14.585952146}