4=9x^2-6x-20

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Solution for 4=9x^2-6x-20 equation:


Simplifying
4 = 9x2 + -6x + -20

Reorder the terms:
4 = -20 + -6x + 9x2

Solving
4 = -20 + -6x + 9x2

Solving for variable 'x'.

Combine like terms: 4 + 20 = 24
24 + 6x + -9x2 = -20 + -6x + 9x2 + 20 + 6x + -9x2

Reorder the terms:
24 + 6x + -9x2 = -20 + 20 + -6x + 6x + 9x2 + -9x2

Combine like terms: -20 + 20 = 0
24 + 6x + -9x2 = 0 + -6x + 6x + 9x2 + -9x2
24 + 6x + -9x2 = -6x + 6x + 9x2 + -9x2

Combine like terms: -6x + 6x = 0
24 + 6x + -9x2 = 0 + 9x2 + -9x2
24 + 6x + -9x2 = 9x2 + -9x2

Combine like terms: 9x2 + -9x2 = 0
24 + 6x + -9x2 = 0

Factor out the Greatest Common Factor (GCF), '3'.
3(8 + 2x + -3x2) = 0

Factor a trinomial.
3((2 + -1x)(4 + 3x)) = 0

Ignore the factor 3.

Subproblem 1

Set the factor '(2 + -1x)' equal to zero and attempt to solve: Simplifying 2 + -1x = 0 Solving 2 + -1x = 0 Move all terms containing x to the left, all other terms to the right. Add '-2' to each side of the equation. 2 + -2 + -1x = 0 + -2 Combine like terms: 2 + -2 = 0 0 + -1x = 0 + -2 -1x = 0 + -2 Combine like terms: 0 + -2 = -2 -1x = -2 Divide each side by '-1'. x = 2 Simplifying x = 2

Subproblem 2

Set the factor '(4 + 3x)' equal to zero and attempt to solve: Simplifying 4 + 3x = 0 Solving 4 + 3x = 0 Move all terms containing x to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + 3x = 0 + -4 Combine like terms: 4 + -4 = 0 0 + 3x = 0 + -4 3x = 0 + -4 Combine like terms: 0 + -4 = -4 3x = -4 Divide each side by '3'. x = -1.333333333 Simplifying x = -1.333333333

Solution

x = {2, -1.333333333}

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