(3b+5)(3b-5)=

Solution for (3b+5)(3b-5)= equation:

Simplifying
(3b + 5)(3b + -5) = 0

Reorder the terms:
(5 + 3b)(3b + -5) = 0

Reorder the terms:
(5 + 3b)(-5 + 3b) = 0

Multiply (5 + 3b) * (-5 + 3b)
(5(-5 + 3b) + 3b * (-5 + 3b)) = 0
((-5 * 5 + 3b * 5) + 3b * (-5 + 3b)) = 0
((-25 + 15b) + 3b * (-5 + 3b)) = 0
(-25 + 15b + (-5 * 3b + 3b * 3b)) = 0
(-25 + 15b + (-15b + 9b2)) = 0

Combine like terms: 15b + -15b = 0
(-25 + 0 + 9b2) = 0
(-25 + 9b2) = 0

Solving
-25 + 9b2 = 0

Solving for variable 'b'.

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

Add '25' to each side of the equation.
-25 + 25 + 9b2 = 0 + 25

Combine like terms: -25 + 25 = 0
0 + 9b2 = 0 + 25
9b2 = 0 + 25

Combine like terms: 0 + 25 = 25
9b2 = 25

Divide each side by '9'.
b2 = 2.777777778

Simplifying
b2 = 2.777777778

Take the square root of each side:
b = {-1.666666667, 1.666666667}