21x^2+5x=6

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Solution for 21x^2+5x=6 equation:


Simplifying
21x2 + 5x = 6

Reorder the terms:
5x + 21x2 = 6

Solving
5x + 21x2 = 6

Solving for variable 'x'.

Reorder the terms:
-6 + 5x + 21x2 = 6 + -6

Combine like terms: 6 + -6 = 0
-6 + 5x + 21x2 = 0

Factor a trinomial.
(-2 + -3x)(3 + -7x) = 0

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 + -7x)' equal to zero and attempt to solve: Simplifying 3 + -7x = 0 Solving 3 + -7x = 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 + -7x = 0 + -3 Combine like terms: 3 + -3 = 0 0 + -7x = 0 + -3 -7x = 0 + -3 Combine like terms: 0 + -3 = -3 -7x = -3 Divide each side by '-7'. x = 0.4285714286 Simplifying x = 0.4285714286

Solution

x = {-0.6666666667, 0.4285714286}

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