x^2-7x=-8x+72

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Solution for x^2-7x=-8x+72 equation:


Simplifying
x2 + -7x = -8x + 72

Reorder the terms:
-7x + x2 = -8x + 72

Reorder the terms:
-7x + x2 = 72 + -8x

Solving
-7x + x2 = 72 + -8x

Solving for variable 'x'.

Reorder the terms:
-72 + -7x + 8x + x2 = 72 + -8x + -72 + 8x

Combine like terms: -7x + 8x = 1x
-72 + 1x + x2 = 72 + -8x + -72 + 8x

Reorder the terms:
-72 + 1x + x2 = 72 + -72 + -8x + 8x

Combine like terms: 72 + -72 = 0
-72 + 1x + x2 = 0 + -8x + 8x
-72 + 1x + x2 = -8x + 8x

Combine like terms: -8x + 8x = 0
-72 + 1x + x2 = 0

Factor a trinomial.
(-9 + -1x)(8 + -1x) = 0

Subproblem 1

Set the factor '(-9 + -1x)' equal to zero and attempt to solve: Simplifying -9 + -1x = 0 Solving -9 + -1x = 0 Move all terms containing x to the left, all other terms to the right. Add '9' to each side of the equation. -9 + 9 + -1x = 0 + 9 Combine like terms: -9 + 9 = 0 0 + -1x = 0 + 9 -1x = 0 + 9 Combine like terms: 0 + 9 = 9 -1x = 9 Divide each side by '-1'. x = -9 Simplifying x = -9

Subproblem 2

Set the factor '(8 + -1x)' equal to zero and attempt to solve: Simplifying 8 + -1x = 0 Solving 8 + -1x = 0 Move all terms containing x to the left, all other terms to the right. Add '-8' to each side of the equation. 8 + -8 + -1x = 0 + -8 Combine like terms: 8 + -8 = 0 0 + -1x = 0 + -8 -1x = 0 + -8 Combine like terms: 0 + -8 = -8 -1x = -8 Divide each side by '-1'. x = 8 Simplifying x = 8

Solution

x = {-9, 8}

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