3x^2-x=x^2-7x+8

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Solution for 3x^2-x=x^2-7x+8 equation:


Simplifying
3x2 + -1x = x2 + -7x + 8

Reorder the terms:
-1x + 3x2 = x2 + -7x + 8

Reorder the terms:
-1x + 3x2 = 8 + -7x + x2

Solving
-1x + 3x2 = 8 + -7x + x2

Solving for variable 'x'.

Reorder the terms:
-8 + -1x + 7x + 3x2 + -1x2 = 8 + -7x + x2 + -8 + 7x + -1x2

Combine like terms: -1x + 7x = 6x
-8 + 6x + 3x2 + -1x2 = 8 + -7x + x2 + -8 + 7x + -1x2

Combine like terms: 3x2 + -1x2 = 2x2
-8 + 6x + 2x2 = 8 + -7x + x2 + -8 + 7x + -1x2

Reorder the terms:
-8 + 6x + 2x2 = 8 + -8 + -7x + 7x + x2 + -1x2

Combine like terms: 8 + -8 = 0
-8 + 6x + 2x2 = 0 + -7x + 7x + x2 + -1x2
-8 + 6x + 2x2 = -7x + 7x + x2 + -1x2

Combine like terms: -7x + 7x = 0
-8 + 6x + 2x2 = 0 + x2 + -1x2
-8 + 6x + 2x2 = x2 + -1x2

Combine like terms: x2 + -1x2 = 0
-8 + 6x + 2x2 = 0

Factor out the Greatest Common Factor (GCF), '2'.
2(-4 + 3x + x2) = 0

Factor a trinomial.
2((-4 + -1x)(1 + -1x)) = 0

Ignore the factor 2.

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

Solution

x = {-4, 1}

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