18-21x=9x^2

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Solution for 18-21x=9x^2 equation:


Simplifying
18 + -21x = 9x2

Solving
18 + -21x = 9x2

Solving for variable 'x'.

Combine like terms: 9x2 + -9x2 = 0
18 + -21x + -9x2 = 0

Factor out the Greatest Common Factor (GCF), '3'.
3(6 + -7x + -3x2) = 0

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

Ignore the factor 3.

Subproblem 1

Set the factor '(2 + -3x)' equal to zero and attempt to solve: Simplifying 2 + -3x = 0 Solving 2 + -3x = 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 + -3x = 0 + -2 Combine like terms: 2 + -2 = 0 0 + -3x = 0 + -2 -3x = 0 + -2 Combine like terms: 0 + -2 = -2 -3x = -2 Divide each side by '-3'. x = 0.6666666667 Simplifying x = 0.6666666667

Subproblem 2

Set the factor '(3 + x)' equal to zero and attempt to solve: Simplifying 3 + x = 0 Solving 3 + x = 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 + x = 0 + -3 Combine like terms: 3 + -3 = 0 0 + x = 0 + -3 x = 0 + -3 Combine like terms: 0 + -3 = -3 x = -3 Simplifying x = -3

Solution

x = {0.6666666667, -3}

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