(9c+10)(9c-10)=

Solution for (9c+10)(9c-10)= equation:

Simplifying
(9c + 10)(9c + -10) = 0

Reorder the terms:
(10 + 9c)(9c + -10) = 0

Reorder the terms:
(10 + 9c)(-10 + 9c) = 0

Multiply (10 + 9c) * (-10 + 9c)
(10(-10 + 9c) + 9c * (-10 + 9c)) = 0
((-10 * 10 + 9c * 10) + 9c * (-10 + 9c)) = 0
((-100 + 90c) + 9c * (-10 + 9c)) = 0
(-100 + 90c + (-10 * 9c + 9c * 9c)) = 0
(-100 + 90c + (-90c + 81c2)) = 0

Combine like terms: 90c + -90c = 0
(-100 + 0 + 81c2) = 0
(-100 + 81c2) = 0

Solving
-100 + 81c2 = 0

Solving for variable 'c'.

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

Add '100' to each side of the equation.
-100 + 100 + 81c2 = 0 + 100

Combine like terms: -100 + 100 = 0
0 + 81c2 = 0 + 100
81c2 = 0 + 100

Combine like terms: 0 + 100 = 100
81c2 = 100

Divide each side by '81'.
c2 = 1.234567901

Simplifying
c2 = 1.234567901

Take the square root of each side:
c = {-1.111111111, 1.111111111}