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

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


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

Reorder the terms:
(-4 + 5x)(9x + 9) = 0

Reorder the terms:
(-4 + 5x)(9 + 9x) = 0

Multiply (-4 + 5x) * (9 + 9x)
(-4(9 + 9x) + 5x * (9 + 9x)) = 0
((9 * -4 + 9x * -4) + 5x * (9 + 9x)) = 0
((-36 + -36x) + 5x * (9 + 9x)) = 0
(-36 + -36x + (9 * 5x + 9x * 5x)) = 0
(-36 + -36x + (45x + 45x2)) = 0

Combine like terms: -36x + 45x = 9x
(-36 + 9x + 45x2) = 0

Solving
-36 + 9x + 45x2 = 0

Solving for variable 'x'.

Factor out the Greatest Common Factor (GCF), '9'.
9(-4 + x + 5x2) = 0

Factor a trinomial.
9((-1 + -1x)(4 + -5x)) = 0

Ignore the factor 9.

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

Simplifying
-1 + -1x = 0

Solving
-1 + -1x = 0

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

Add '1' to each side of the equation.
-1 + 1 + -1x = 0 + 1

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

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

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

Simplifying
x = -1

Subproblem 2
Set the factor '(4 + -5x)' equal to zero and attempt to solve:

Simplifying
4 + -5x = 0

Solving
4 + -5x = 0

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

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

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

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

Divide each side by '-5'.
x = 0.8

Simplifying
x = 0.8
Solution
x = {-1, 0.8}

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