5x^2+20x-90=99-4x^2-16x

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Solution for 5x^2+20x-90=99-4x^2-16x equation:


Simplifying
5x2 + 20x + -90 = 99 + -4x2 + -16x

Reorder the terms:
-90 + 20x + 5x2 = 99 + -4x2 + -16x

Reorder the terms:
-90 + 20x + 5x2 = 99 + -16x + -4x2

Solving
-90 + 20x + 5x2 = 99 + -16x + -4x2

Solving for variable 'x'.

Reorder the terms:
-90 + -99 + 20x + 16x + 5x2 + 4x2 = 99 + -16x + -4x2 + -99 + 16x + 4x2

Combine like terms: -90 + -99 = -189
-189 + 20x + 16x + 5x2 + 4x2 = 99 + -16x + -4x2 + -99 + 16x + 4x2

Combine like terms: 20x + 16x = 36x
-189 + 36x + 5x2 + 4x2 = 99 + -16x + -4x2 + -99 + 16x + 4x2

Combine like terms: 5x2 + 4x2 = 9x2
-189 + 36x + 9x2 = 99 + -16x + -4x2 + -99 + 16x + 4x2

Reorder the terms:
-189 + 36x + 9x2 = 99 + -99 + -16x + 16x + -4x2 + 4x2

Combine like terms: 99 + -99 = 0
-189 + 36x + 9x2 = 0 + -16x + 16x + -4x2 + 4x2
-189 + 36x + 9x2 = -16x + 16x + -4x2 + 4x2

Combine like terms: -16x + 16x = 0
-189 + 36x + 9x2 = 0 + -4x2 + 4x2
-189 + 36x + 9x2 = -4x2 + 4x2

Combine like terms: -4x2 + 4x2 = 0
-189 + 36x + 9x2 = 0

Factor out the Greatest Common Factor (GCF), '9'.
9(-21 + 4x + x2) = 0

Factor a trinomial.
9((-7 + -1x)(3 + -1x)) = 0

Ignore the factor 9.

Subproblem 1

Set the factor '(-7 + -1x)' equal to zero and attempt to solve: Simplifying -7 + -1x = 0 Solving -7 + -1x = 0 Move all terms containing x to the left, all other terms to the right. Add '7' to each side of the equation. -7 + 7 + -1x = 0 + 7 Combine like terms: -7 + 7 = 0 0 + -1x = 0 + 7 -1x = 0 + 7 Combine like terms: 0 + 7 = 7 -1x = 7 Divide each side by '-1'. x = -7 Simplifying x = -7

Subproblem 2

Set the factor '(3 + -1x)' equal to zero and attempt to solve: Simplifying 3 + -1x = 0 Solving 3 + -1x = 0 Move all terms containing x to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + -1x = 0 + -3 Combine like terms: 3 + -3 = 0 0 + -1x = 0 + -3 -1x = 0 + -3 Combine like terms: 0 + -3 = -3 -1x = -3 Divide each side by '-1'. x = 3 Simplifying x = 3

Solution

x = {-7, 3}

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