-x^2+4x=x-4

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Solution for -x^2+4x=x-4 equation:


Simplifying
-1x2 + 4x = x + -4

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

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

Solving
4x + -1x2 = -4 + x

Solving for variable 'x'.

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

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

Reorder the terms:
4 + 3x + -1x2 = -4 + 4 + x + -1x

Combine like terms: -4 + 4 = 0
4 + 3x + -1x2 = 0 + x + -1x
4 + 3x + -1x2 = x + -1x

Combine like terms: x + -1x = 0
4 + 3x + -1x2 = 0

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

Subproblem 1

Set the factor '(4 + -1x)' equal to zero and attempt to solve: Simplifying 4 + -1x = 0 Solving 4 + -1x = 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 + -1x = 0 + -4 Combine like terms: 4 + -4 = 0 0 + -1x = 0 + -4 -1x = 0 + -4 Combine like terms: 0 + -4 = -4 -1x = -4 Divide each side by '-1'. x = 4 Simplifying x = 4

Subproblem 2

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

Solution

x = {4, -1}

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