(4s+5)(4s-5)=

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

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

Reorder the terms:
(5 + 4s)(4s + -5) = 0

Reorder the terms:
(5 + 4s)(-5 + 4s) = 0

Multiply (5 + 4s) * (-5 + 4s)
(5(-5 + 4s) + 4s * (-5 + 4s)) = 0
((-5 * 5 + 4s * 5) + 4s * (-5 + 4s)) = 0
((-25 + 20s) + 4s * (-5 + 4s)) = 0
(-25 + 20s + (-5 * 4s + 4s * 4s)) = 0
(-25 + 20s + (-20s + 16s2)) = 0

Combine like terms: 20s + -20s = 0
(-25 + 0 + 16s2) = 0
(-25 + 16s2) = 0

Solving
-25 + 16s2 = 0

Solving for variable 's'.

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

Add '25' to each side of the equation.
-25 + 25 + 16s2 = 0 + 25

Combine like terms: -25 + 25 = 0
0 + 16s2 = 0 + 25
16s2 = 0 + 25

Combine like terms: 0 + 25 = 25
16s2 = 25

Divide each side by '16'.
s2 = 1.5625

Simplifying
s2 = 1.5625

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