(9-4x)(9+4x)=

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Solution for (9-4x)(9+4x)= equation: 


Simplifying
(9 + -4x)(9 + 4x) = 0

Multiply (9 + -4x) * (9 + 4x)
(9(9 + 4x) + -4x * (9 + 4x)) = 0
((9 * 9 + 4x * 9) + -4x * (9 + 4x)) = 0
((81 + 36x) + -4x * (9 + 4x)) = 0
(81 + 36x + (9 * -4x + 4x * -4x)) = 0
(81 + 36x + (-36x + -16x2)) = 0

Combine like terms: 36x + -36x = 0
(81 + 0 + -16x2) = 0
(81 + -16x2) = 0

Solving
81 + -16x2 = 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 + -16x2 = 0 + -81

Combine like terms: 81 + -81 = 0
0 + -16x2 = 0 + -81
-16x2 = 0 + -81

Combine like terms: 0 + -81 = -81
-16x2 = -81

Divide each side by '-16'.
x2 = 5.0625

Simplifying
x2 = 5.0625

Take the square root of each side:
x = {-2.25, 2.25}

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