x^2-3x=4x^2-36

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Solution for x^2-3x=4x^2-36 equation:


Simplifying
x2 + -3x = 4x2 + -36

Reorder the terms:
-3x + x2 = 4x2 + -36

Reorder the terms:
-3x + x2 = -36 + 4x2

Solving
-3x + x2 = -36 + 4x2

Solving for variable 'x'.

Reorder the terms:
36 + -3x + x2 + -4x2 = -36 + 4x2 + 36 + -4x2

Combine like terms: x2 + -4x2 = -3x2
36 + -3x + -3x2 = -36 + 4x2 + 36 + -4x2

Reorder the terms:
36 + -3x + -3x2 = -36 + 36 + 4x2 + -4x2

Combine like terms: -36 + 36 = 0
36 + -3x + -3x2 = 0 + 4x2 + -4x2
36 + -3x + -3x2 = 4x2 + -4x2

Combine like terms: 4x2 + -4x2 = 0
36 + -3x + -3x2 = 0

Factor out the Greatest Common Factor (GCF), '3'.
3(12 + -1x + -1x2) = 0

Factor a trinomial.
3((3 + -1x)(4 + x)) = 0

Ignore the factor 3.

Subproblem 1

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

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 = {3, -4}

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