-(5x+9)(5x-9)=

Solution for -(5x+9)(5x-9)= equation:

Simplifying
-1(5x + 9)(5x + -9) = 0

Reorder the terms:
-1(9 + 5x)(5x + -9) = 0

Reorder the terms:
-1(9 + 5x)(-9 + 5x) = 0

Multiply (9 + 5x) * (-9 + 5x)
-1(9(-9 + 5x) + 5x * (-9 + 5x)) = 0
-1((-9 * 9 + 5x * 9) + 5x * (-9 + 5x)) = 0
-1((-81 + 45x) + 5x * (-9 + 5x)) = 0
-1(-81 + 45x + (-9 * 5x + 5x * 5x)) = 0
-1(-81 + 45x + (-45x + 25x2)) = 0

Combine like terms: 45x + -45x = 0
-1(-81 + 0 + 25x2) = 0
-1(-81 + 25x2) = 0
(-81 * -1 + 25x2 * -1) = 0
(81 + -25x2) = 0

Solving
81 + -25x2 = 0

Solving for variable 'x'.

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

Add '-81' to each side of the equation.
81 + -81 + -25x2 = 0 + -81

Combine like terms: 81 + -81 = 0
0 + -25x2 = 0 + -81
-25x2 = 0 + -81

Combine like terms: 0 + -81 = -81
-25x2 = -81

Divide each side by '-25'.
x2 = 3.24

Simplifying
x2 = 3.24

Take the square root of each side:
x = {-1.8, 1.8}