9b^2-15b=84

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Solution for 9b^2-15b=84 equation:


Simplifying
9b2 + -15b = 84

Reorder the terms:
-15b + 9b2 = 84

Solving
-15b + 9b2 = 84

Solving for variable 'b'.

Reorder the terms:
-84 + -15b + 9b2 = 84 + -84

Combine like terms: 84 + -84 = 0
-84 + -15b + 9b2 = 0

Factor out the Greatest Common Factor (GCF), '3'.
3(-28 + -5b + 3b2) = 0

Factor a trinomial.
3((-7 + -3b)(4 + -1b)) = 0

Ignore the factor 3.

Subproblem 1

Set the factor '(-7 + -3b)' equal to zero and attempt to solve: Simplifying -7 + -3b = 0 Solving -7 + -3b = 0 Move all terms containing b to the left, all other terms to the right. Add '7' to each side of the equation. -7 + 7 + -3b = 0 + 7 Combine like terms: -7 + 7 = 0 0 + -3b = 0 + 7 -3b = 0 + 7 Combine like terms: 0 + 7 = 7 -3b = 7 Divide each side by '-3'. b = -2.333333333 Simplifying b = -2.333333333

Subproblem 2

Set the factor '(4 + -1b)' equal to zero and attempt to solve: Simplifying 4 + -1b = 0 Solving 4 + -1b = 0 Move all terms containing b to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + -1b = 0 + -4 Combine like terms: 4 + -4 = 0 0 + -1b = 0 + -4 -1b = 0 + -4 Combine like terms: 0 + -4 = -4 -1b = -4 Divide each side by '-1'. b = 4 Simplifying b = 4

Solution

b = {-2.333333333, 4}

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