X^2+18X+84=7

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Solution for X^2+18X+84=7 equation:


Simplifying
X2 + 18X + 84 = 7

Reorder the terms:
84 + 18X + X2 = 7

Solving
84 + 18X + X2 = 7

Solving for variable 'X'.

Reorder the terms:
84 + -7 + 18X + X2 = 7 + -7

Combine like terms: 84 + -7 = 77
77 + 18X + X2 = 7 + -7

Combine like terms: 7 + -7 = 0
77 + 18X + X2 = 0

Factor a trinomial.
(11 + X)(7 + X) = 0

Subproblem 1

Set the factor '(11 + X)' equal to zero and attempt to solve: Simplifying 11 + X = 0 Solving 11 + X = 0 Move all terms containing X to the left, all other terms to the right. Add '-11' to each side of the equation. 11 + -11 + X = 0 + -11 Combine like terms: 11 + -11 = 0 0 + X = 0 + -11 X = 0 + -11 Combine like terms: 0 + -11 = -11 X = -11 Simplifying X = -11

Subproblem 2

Set the factor '(7 + X)' equal to zero and attempt to solve: Simplifying 7 + X = 0 Solving 7 + X = 0 Move all terms containing X to the left, all other terms to the right. Add '-7' to each side of the equation. 7 + -7 + X = 0 + -7 Combine like terms: 7 + -7 = 0 0 + X = 0 + -7 X = 0 + -7 Combine like terms: 0 + -7 = -7 X = -7 Simplifying X = -7

Solution

X = {-11, -7}

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