(7c+4)(7c-4)=

Solution for (7c+4)(7c-4)= equation:

Simplifying
(7c + 4)(7c + -4) = 0

Reorder the terms:
(4 + 7c)(7c + -4) = 0

Reorder the terms:
(4 + 7c)(-4 + 7c) = 0

Multiply (4 + 7c) * (-4 + 7c)
(4(-4 + 7c) + 7c * (-4 + 7c)) = 0
((-4 * 4 + 7c * 4) + 7c * (-4 + 7c)) = 0
((-16 + 28c) + 7c * (-4 + 7c)) = 0
(-16 + 28c + (-4 * 7c + 7c * 7c)) = 0
(-16 + 28c + (-28c + 49c2)) = 0

Combine like terms: 28c + -28c = 0
(-16 + 0 + 49c2) = 0
(-16 + 49c2) = 0

Solving
-16 + 49c2 = 0

Solving for variable 'c'.

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

Add '16' to each side of the equation.
-16 + 16 + 49c2 = 0 + 16

Combine like terms: -16 + 16 = 0
0 + 49c2 = 0 + 16
49c2 = 0 + 16

Combine like terms: 0 + 16 = 16
49c2 = 16

Divide each side by '49'.
c2 = 0.3265306122

Simplifying
c2 = 0.3265306122

Take the square root of each side:
c = {-0.571428571, 0.571428571}