3x^2=21x-36

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Solution for 3x^2=21x-36 equation:


Simplifying
3x2 = 21x + -36

Reorder the terms:
3x2 = -36 + 21x

Solving
3x2 = -36 + 21x

Solving for variable 'x'.

Reorder the terms:
36 + -21x + 3x2 = -36 + 21x + 36 + -21x

Reorder the terms:
36 + -21x + 3x2 = -36 + 36 + 21x + -21x

Combine like terms: -36 + 36 = 0
36 + -21x + 3x2 = 0 + 21x + -21x
36 + -21x + 3x2 = 21x + -21x

Combine like terms: 21x + -21x = 0
36 + -21x + 3x2 = 0

Factor out the Greatest Common Factor (GCF), '3'.
3(12 + -7x + x2) = 0

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

Ignore the factor 3.

Subproblem 1

Set the factor '(3 + -1x)' equal to zero and attempt to solve: Simplifying 3 + -1x = 0 Solving 3 + -1x = 0 Move all terms containing x to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + -1x = 0 + -3 Combine like terms: 3 + -3 = 0 0 + -1x = 0 + -3 -1x = 0 + -3 Combine like terms: 0 + -3 = -3 -1x = -3 Divide each side by '-1'. x = 3 Simplifying x = 3

Subproblem 2

Set the factor '(4 + -1x)' equal to zero and attempt to solve: Simplifying 4 + -1x = 0 Solving 4 + -1x = 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 + -1x = 0 + -4 Combine like terms: 4 + -4 = 0 0 + -1x = 0 + -4 -1x = 0 + -4 Combine like terms: 0 + -4 = -4 -1x = -4 Divide each side by '-1'. x = 4 Simplifying x = 4

Solution

x = {3, 4}

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