x^2+3x-21x=-3x^2

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Solution for x^2+3x-21x=-3x^2 equation:


Simplifying
x2 + 3x + -21x = -3x2

Reorder the terms:
3x + -21x + x2 = -3x2

Combine like terms: 3x + -21x = -18x
-18x + x2 = -3x2

Solving
-18x + x2 = -3x2

Solving for variable 'x'.

Combine like terms: x2 + 3x2 = 4x2
-18x + 4x2 = -3x2 + 3x2

Combine like terms: -3x2 + 3x2 = 0
-18x + 4x2 = 0

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

Ignore the factor 2.

Subproblem 1

Set the factor 'x' equal to zero and attempt to solve: Simplifying x = 0 Solving x = 0 Move all terms containing x to the left, all other terms to the right. Simplifying x = 0

Subproblem 2

Set the factor '(-9 + 2x)' equal to zero and attempt to solve: Simplifying -9 + 2x = 0 Solving -9 + 2x = 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 + 2x = 0 + 9 Combine like terms: -9 + 9 = 0 0 + 2x = 0 + 9 2x = 0 + 9 Combine like terms: 0 + 9 = 9 2x = 9 Divide each side by '2'. x = 4.5 Simplifying x = 4.5

Solution

x = {0, 4.5}

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