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

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


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

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

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

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

Combine like terms: -36x + 9x = -27x
(-81 + -27x + 4x2) = 0

Solving
-81 + -27x + 4x2 = 0

Solving for variable 'x'.

Factor a trinomial.
(-9 + -4x)(9 + -1x) = 0


Subproblem 1
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

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

Simplifying
9 + -1x = 0

Solving
9 + -1x = 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 + -1x = 0 + -9

Combine like terms: 9 + -9 = 0
0 + -1x = 0 + -9
-1x = 0 + -9

Combine like terms: 0 + -9 = -9
-1x = -9

Divide each side by '-1'.
x = 9

Simplifying
x = 9
Solution
x = {-2.25, 9}

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