3x^2+5x=x^2-7x-18

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Solution for 3x^2+5x=x^2-7x-18 equation:


Simplifying
3x2 + 5x = x2 + -7x + -18

Reorder the terms:
5x + 3x2 = x2 + -7x + -18

Reorder the terms:
5x + 3x2 = -18 + -7x + x2

Solving
5x + 3x2 = -18 + -7x + x2

Solving for variable 'x'.

Reorder the terms:
18 + 5x + 7x + 3x2 + -1x2 = -18 + -7x + x2 + 18 + 7x + -1x2

Combine like terms: 5x + 7x = 12x
18 + 12x + 3x2 + -1x2 = -18 + -7x + x2 + 18 + 7x + -1x2

Combine like terms: 3x2 + -1x2 = 2x2
18 + 12x + 2x2 = -18 + -7x + x2 + 18 + 7x + -1x2

Reorder the terms:
18 + 12x + 2x2 = -18 + 18 + -7x + 7x + x2 + -1x2

Combine like terms: -18 + 18 = 0
18 + 12x + 2x2 = 0 + -7x + 7x + x2 + -1x2
18 + 12x + 2x2 = -7x + 7x + x2 + -1x2

Combine like terms: -7x + 7x = 0
18 + 12x + 2x2 = 0 + x2 + -1x2
18 + 12x + 2x2 = x2 + -1x2

Combine like terms: x2 + -1x2 = 0
18 + 12x + 2x2 = 0

Factor out the Greatest Common Factor (GCF), '2'.
2(9 + 6x + x2) = 0

Factor a trinomial.
2((3 + x)(3 + x)) = 0

Ignore the factor 2.

Subproblem 1

Set the factor '(3 + x)' equal to zero and attempt to solve: Simplifying 3 + x = 0 Solving 3 + x = 0 Move all terms containing x to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + x = 0 + -3 Combine like terms: 3 + -3 = 0 0 + x = 0 + -3 x = 0 + -3 Combine like terms: 0 + -3 = -3 x = -3 Simplifying x = -3

Subproblem 2

Set the factor '(3 + x)' equal to zero and attempt to solve: Simplifying 3 + x = 0 Solving 3 + x = 0 Move all terms containing x to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + x = 0 + -3 Combine like terms: 3 + -3 = 0 0 + x = 0 + -3 x = 0 + -3 Combine like terms: 0 + -3 = -3 x = -3 Simplifying x = -3

Solution

x = {-3, -3}

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