X^2-120=7X

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Solution for X^2-120=7X equation:


Simplifying
X2 + -120 = 7X

Reorder the terms:
-120 + X2 = 7X

Solving
-120 + X2 = 7X

Solving for variable 'X'.

Reorder the terms:
-120 + -7X + X2 = 7X + -7X

Combine like terms: 7X + -7X = 0
-120 + -7X + X2 = 0

Factor a trinomial.
(-8 + -1X)(15 + -1X) = 0

Subproblem 1

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

Subproblem 2

Set the factor '(15 + -1X)' equal to zero and attempt to solve: Simplifying 15 + -1X = 0 Solving 15 + -1X = 0 Move all terms containing X to the left, all other terms to the right. Add '-15' to each side of the equation. 15 + -15 + -1X = 0 + -15 Combine like terms: 15 + -15 = 0 0 + -1X = 0 + -15 -1X = 0 + -15 Combine like terms: 0 + -15 = -15 -1X = -15 Divide each side by '-1'. X = 15 Simplifying X = 15

Solution

X = {-8, 15}

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