(2x+9)(4x-9)=0

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Solution for (2x+9)(4x-9)=0 equation: 


Simplifying
(2x + 9)(4x + -9) = 0

Reorder the terms:
(9 + 2x)(4x + -9) = 0

Reorder the terms:
(9 + 2x)(-9 + 4x) = 0

Multiply (9 + 2x) * (-9 + 4x)
(9(-9 + 4x) + 2x * (-9 + 4x)) = 0
((-9 * 9 + 4x * 9) + 2x * (-9 + 4x)) = 0
((-81 + 36x) + 2x * (-9 + 4x)) = 0
(-81 + 36x + (-9 * 2x + 4x * 2x)) = 0
(-81 + 36x + (-18x + 8x2)) = 0

Combine like terms: 36x + -18x = 18x
(-81 + 18x + 8x2) = 0

Solving
-81 + 18x + 8x2 = 0

Solving for variable 'x'.

Factor a trinomial.
(-9 + -2x)(9 + -4x) = 0


Subproblem 1
Set the factor '(-9 + -2x)' equal to zero and attempt to solve:

Simplifying
-9 + -2x = 0

Solving
-9 + -2x = 0

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

Add '9' to each side of the equation.
-9 + 9 + -2x = 0 + 9

Combine like terms: -9 + 9 = 0
0 + -2x = 0 + 9
-2x = 0 + 9

Combine like terms: 0 + 9 = 9
-2x = 9

Divide each side by '-2'.
x = -4.5

Simplifying
x = -4.5

Subproblem 2
Set the factor '(9 + -4x)' equal to zero and attempt to solve:

Simplifying
9 + -4x = 0

Solving
9 + -4x = 0

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

Add '-9' to each side of the equation.
9 + -9 + -4x = 0 + -9

Combine like terms: 9 + -9 = 0
0 + -4x = 0 + -9
-4x = 0 + -9

Combine like terms: 0 + -9 = -9
-4x = -9

Divide each side by '-4'.
x = 2.25

Simplifying
x = 2.25
Solution
x = {-4.5, 2.25}

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