(7s+4)(7s-4)=

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

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

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

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

Multiply (4 + 7s) * (-4 + 7s)
(4(-4 + 7s) + 7s * (-4 + 7s)) = 0
((-4 * 4 + 7s * 4) + 7s * (-4 + 7s)) = 0
((-16 + 28s) + 7s * (-4 + 7s)) = 0
(-16 + 28s + (-4 * 7s + 7s * 7s)) = 0
(-16 + 28s + (-28s + 49s2)) = 0

Combine like terms: 28s + -28s = 0
(-16 + 0 + 49s2) = 0
(-16 + 49s2) = 0

Solving
-16 + 49s2 = 0

Solving for variable 's'.

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

Add '16' to each side of the equation.
-16 + 16 + 49s2 = 0 + 16

Combine like terms: -16 + 16 = 0
0 + 49s2 = 0 + 16
49s2 = 0 + 16

Combine like terms: 0 + 16 = 16
49s2 = 16

Divide each side by '49'.
s2 = 0.3265306122

Simplifying
s2 = 0.3265306122

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