3x^2+x+12=4x^2-8

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Solution for 3x^2+x+12=4x^2-8 equation:


Simplifying
3x2 + x + 12 = 4x2 + -8

Reorder the terms:
12 + x + 3x2 = 4x2 + -8

Reorder the terms:
12 + x + 3x2 = -8 + 4x2

Solving
12 + x + 3x2 = -8 + 4x2

Solving for variable 'x'.

Reorder the terms:
12 + 8 + x + 3x2 + -4x2 = -8 + 4x2 + 8 + -4x2

Combine like terms: 12 + 8 = 20
20 + x + 3x2 + -4x2 = -8 + 4x2 + 8 + -4x2

Combine like terms: 3x2 + -4x2 = -1x2
20 + x + -1x2 = -8 + 4x2 + 8 + -4x2

Reorder the terms:
20 + x + -1x2 = -8 + 8 + 4x2 + -4x2

Combine like terms: -8 + 8 = 0
20 + x + -1x2 = 0 + 4x2 + -4x2
20 + x + -1x2 = 4x2 + -4x2

Combine like terms: 4x2 + -4x2 = 0
20 + x + -1x2 = 0

Factor a trinomial.
(5 + -1x)(4 + x) = 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 + x)' equal to zero and attempt to solve: Simplifying 4 + x = 0 Solving 4 + x = 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 + x = 0 + -4 Combine like terms: 4 + -4 = 0 0 + x = 0 + -4 x = 0 + -4 Combine like terms: 0 + -4 = -4 x = -4 Simplifying x = -4

Solution

x = {5, -4}

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