21b^2-57b-18=

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Solution for 21b^2-57b-18= equation:


Simplifying
21b2 + -57b + -18 = 0

Reorder the terms:
-18 + -57b + 21b2 = 0

Solving
-18 + -57b + 21b2 = 0

Solving for variable 'b'.

Factor out the Greatest Common Factor (GCF), '3'.
3(-6 + -19b + 7b2) = 0

Factor a trinomial.
3((-2 + -7b)(3 + -1b)) = 0

Ignore the factor 3.

Subproblem 1

Set the factor '(-2 + -7b)' equal to zero and attempt to solve: Simplifying -2 + -7b = 0 Solving -2 + -7b = 0 Move all terms containing b to the left, all other terms to the right. Add '2' to each side of the equation. -2 + 2 + -7b = 0 + 2 Combine like terms: -2 + 2 = 0 0 + -7b = 0 + 2 -7b = 0 + 2 Combine like terms: 0 + 2 = 2 -7b = 2 Divide each side by '-7'. b = -0.2857142857 Simplifying b = -0.2857142857

Subproblem 2

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

Solution

b = {-0.2857142857, 3}

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