x(8x+12)=3x^2-9x+20

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Solution for x(8x+12)=3x^2-9x+20 equation:


Simplifying
x(8x + 12) = 3x2 + -9x + 20

Reorder the terms:
x(12 + 8x) = 3x2 + -9x + 20
(12 * x + 8x * x) = 3x2 + -9x + 20
(12x + 8x2) = 3x2 + -9x + 20

Reorder the terms:
12x + 8x2 = 20 + -9x + 3x2

Solving
12x + 8x2 = 20 + -9x + 3x2

Solving for variable 'x'.

Reorder the terms:
-20 + 12x + 9x + 8x2 + -3x2 = 20 + -9x + 3x2 + -20 + 9x + -3x2

Combine like terms: 12x + 9x = 21x
-20 + 21x + 8x2 + -3x2 = 20 + -9x + 3x2 + -20 + 9x + -3x2

Combine like terms: 8x2 + -3x2 = 5x2
-20 + 21x + 5x2 = 20 + -9x + 3x2 + -20 + 9x + -3x2

Reorder the terms:
-20 + 21x + 5x2 = 20 + -20 + -9x + 9x + 3x2 + -3x2

Combine like terms: 20 + -20 = 0
-20 + 21x + 5x2 = 0 + -9x + 9x + 3x2 + -3x2
-20 + 21x + 5x2 = -9x + 9x + 3x2 + -3x2

Combine like terms: -9x + 9x = 0
-20 + 21x + 5x2 = 0 + 3x2 + -3x2
-20 + 21x + 5x2 = 3x2 + -3x2

Combine like terms: 3x2 + -3x2 = 0
-20 + 21x + 5x2 = 0

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

Subproblem 1

Set the factor '(-5 + -1x)' equal to zero and attempt to solve: Simplifying -5 + -1x = 0 Solving -5 + -1x = 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 + -1x = 0 + 5 Combine like terms: -5 + 5 = 0 0 + -1x = 0 + 5 -1x = 0 + 5 Combine like terms: 0 + 5 = 5 -1x = 5 Divide each side by '-1'. x = -5 Simplifying x = -5

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 = {-5, 0.8}

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