X^2-18=-2x^2-15

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Solution for X^2-18=-2x^2-15 equation:


Simplifying
X2 + -18 = -2x2 + -15

Reorder the terms:
-18 + X2 = -2x2 + -15

Reorder the terms:
-18 + X2 = -15 + -2x2

Solving
-18 + X2 = -15 + -2x2

Solving for variable 'X'.

Move all terms containing X to the left, all other terms to the right.

Add '18' to each side of the equation.
-18 + 18 + X2 = -15 + 18 + -2x2

Combine like terms: -18 + 18 = 0
0 + X2 = -15 + 18 + -2x2
X2 = -15 + 18 + -2x2

Combine like terms: -15 + 18 = 3
X2 = 3 + -2x2

Simplifying
X2 = 3 + -2x2

Reorder the terms:
-3 + X2 + 2x2 = 3 + -2x2 + -3 + 2x2

Reorder the terms:
-3 + X2 + 2x2 = 3 + -3 + -2x2 + 2x2

Combine like terms: 3 + -3 = 0
-3 + X2 + 2x2 = 0 + -2x2 + 2x2
-3 + X2 + 2x2 = -2x2 + 2x2

Combine like terms: -2x2 + 2x2 = 0
-3 + X2 + 2x2 = 0

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

Subproblem 1

Set the factor '(X + -2x)' equal to zero and attempt to solve: Simplifying X + -2x = 0 Solving X + -2x = 0 Move all terms containing X to the left, all other terms to the right. Add '2x' to each side of the equation. X + -2x + 2x = 0 + 2x Combine like terms: -2x + 2x = 0 X + 0 = 0 + 2x X = 0 + 2x Remove the zero: X = 2x Simplifying X = 2x

Subproblem 2

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

Solution

X = {2x, x}

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