65=c(c)

Solution for 65=c(c) equation:

Simplifying
65 = c(c)

Multiply c * c
65 = c2

Solving
65 = 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.
65 + -1c2 = c2 + -1c2

Combine like terms: c2 + -1c2 = 0
65 + -1c2 = 0

Add '-65' to each side of the equation.
65 + -65 + -1c2 = 0 + -65

Combine like terms: 65 + -65 = 0
0 + -1c2 = 0 + -65
-1c2 = 0 + -65

Combine like terms: 0 + -65 = -65
-1c2 = -65

Divide each side by '-1'.
c2 = 65

Simplifying
c2 = 65

Take the square root of each side:
c = {-8.062257748, 8.062257748}