4x(2x+9)-5(2x+9)=0

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Solution for 4x(2x+9)-5(2x+9)=0 equation: 


Simplifying
4x(2x + 9) + -5(2x + 9) = 0

Reorder the terms:
4x(9 + 2x) + -5(2x + 9) = 0
(9 * 4x + 2x * 4x) + -5(2x + 9) = 0
(36x + 8x2) + -5(2x + 9) = 0

Reorder the terms:
36x + 8x2 + -5(9 + 2x) = 0
36x + 8x2 + (9 * -5 + 2x * -5) = 0
36x + 8x2 + (-45 + -10x) = 0

Reorder the terms:
-45 + 36x + -10x + 8x2 = 0

Combine like terms: 36x + -10x = 26x
-45 + 26x + 8x2 = 0

Solving
-45 + 26x + 8x2 = 0

Solving for variable 'x'.

Factor a trinomial.
(-9 + -2x)(5 + -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 '(5 + -4x)' equal to zero and attempt to solve:

Simplifying
5 + -4x = 0

Solving
5 + -4x = 0

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

Add '-5' to each side of the equation.
5 + -5 + -4x = 0 + -5

Combine like terms: 5 + -5 = 0
0 + -4x = 0 + -5
-4x = 0 + -5

Combine like terms: 0 + -5 = -5
-4x = -5

Divide each side by '-4'.
x = 1.25

Simplifying
x = 1.25
Solution
x = {-4.5, 1.25}

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