3x^2=180-21x

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Solution for 3x^2=180-21x equation:


Simplifying
3x2 = 180 + -21x

Solving
3x2 = 180 + -21x

Solving for variable 'x'.

Reorder the terms:
-180 + 21x + 3x2 = 180 + -21x + -180 + 21x

Reorder the terms:
-180 + 21x + 3x2 = 180 + -180 + -21x + 21x

Combine like terms: 180 + -180 = 0
-180 + 21x + 3x2 = 0 + -21x + 21x
-180 + 21x + 3x2 = -21x + 21x

Combine like terms: -21x + 21x = 0
-180 + 21x + 3x2 = 0

Factor out the Greatest Common Factor (GCF), '3'.
3(-60 + 7x + x2) = 0

Factor a trinomial.
3((-12 + -1x)(5 + -1x)) = 0

Ignore the factor 3.

Subproblem 1

Set the factor '(-12 + -1x)' equal to zero and attempt to solve: Simplifying -12 + -1x = 0 Solving -12 + -1x = 0 Move all terms containing x to the left, all other terms to the right. Add '12' to each side of the equation. -12 + 12 + -1x = 0 + 12 Combine like terms: -12 + 12 = 0 0 + -1x = 0 + 12 -1x = 0 + 12 Combine like terms: 0 + 12 = 12 -1x = 12 Divide each side by '-1'. x = -12 Simplifying x = -12

Subproblem 2

Set the factor '(5 + -1x)' equal to zero and attempt to solve: Simplifying 5 + -1x = 0 Solving 5 + -1x = 0 Move all terms containing x to the left, all other terms to the right. Add '-5' to each side of the equation. 5 + -5 + -1x = 0 + -5 Combine like terms: 5 + -5 = 0 0 + -1x = 0 + -5 -1x = 0 + -5 Combine like terms: 0 + -5 = -5 -1x = -5 Divide each side by '-1'. x = 5 Simplifying x = 5

Solution

x = {-12, 5}

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