(5-4c)(5+4c)=

Solution for (5-4c)(5+4c)= equation:

Simplifying
(5 + -4c)(5 + 4c) = 0

Multiply (5 + -4c) * (5 + 4c)
(5(5 + 4c) + -4c * (5 + 4c)) = 0
((5 * 5 + 4c * 5) + -4c * (5 + 4c)) = 0
((25 + 20c) + -4c * (5 + 4c)) = 0
(25 + 20c + (5 * -4c + 4c * -4c)) = 0
(25 + 20c + (-20c + -16c2)) = 0

Combine like terms: 20c + -20c = 0
(25 + 0 + -16c2) = 0
(25 + -16c2) = 0

Solving
25 + -16c2 = 0

Solving for variable 'c'.

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

Add '-25' to each side of the equation.
25 + -25 + -16c2 = 0 + -25

Combine like terms: 25 + -25 = 0
0 + -16c2 = 0 + -25
-16c2 = 0 + -25

Combine like terms: 0 + -25 = -25
-16c2 = -25

Divide each side by '-16'.
c2 = 1.5625

Simplifying
c2 = 1.5625

Take the square root of each side:
c = {-1.25, 1.25}