21x^2-132x-108=-3

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Solution for 21x^2-132x-108=-3 equation:


Simplifying
21x2 + -132x + -108 = -3

Reorder the terms:
-108 + -132x + 21x2 = -3

Solving
-108 + -132x + 21x2 = -3

Solving for variable 'x'.

Reorder the terms:
-108 + 3 + -132x + 21x2 = -3 + 3

Combine like terms: -108 + 3 = -105
-105 + -132x + 21x2 = -3 + 3

Combine like terms: -3 + 3 = 0
-105 + -132x + 21x2 = 0

Factor out the Greatest Common Factor (GCF), '3'.
3(-35 + -44x + 7x2) = 0

Factor a trinomial.
3((-5 + -7x)(7 + -1x)) = 0

Ignore the factor 3.

Subproblem 1

Set the factor '(-5 + -7x)' equal to zero and attempt to solve: Simplifying -5 + -7x = 0 Solving -5 + -7x = 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 + -7x = 0 + 5 Combine like terms: -5 + 5 = 0 0 + -7x = 0 + 5 -7x = 0 + 5 Combine like terms: 0 + 5 = 5 -7x = 5 Divide each side by '-7'. x = -0.7142857143 Simplifying x = -0.7142857143

Subproblem 2

Set the factor '(7 + -1x)' equal to zero and attempt to solve: Simplifying 7 + -1x = 0 Solving 7 + -1x = 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 + -1x = 0 + -7 Combine like terms: 7 + -7 = 0 0 + -1x = 0 + -7 -1x = 0 + -7 Combine like terms: 0 + -7 = -7 -1x = -7 Divide each side by '-1'. x = 7 Simplifying x = 7

Solution

x = {-0.7142857143, 7}

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