b^2=5b+84

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Solution for b^2=5b+84 equation:


Simplifying
b2 = 5b + 84

Reorder the terms:
b2 = 84 + 5b

Solving
b2 = 84 + 5b

Solving for variable 'b'.

Reorder the terms:
-84 + -5b + b2 = 84 + 5b + -84 + -5b

Reorder the terms:
-84 + -5b + b2 = 84 + -84 + 5b + -5b

Combine like terms: 84 + -84 = 0
-84 + -5b + b2 = 0 + 5b + -5b
-84 + -5b + b2 = 5b + -5b

Combine like terms: 5b + -5b = 0
-84 + -5b + b2 = 0

Factor a trinomial.
(-7 + -1b)(12 + -1b) = 0

Subproblem 1

Set the factor '(-7 + -1b)' equal to zero and attempt to solve: Simplifying -7 + -1b = 0 Solving -7 + -1b = 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 + -1b = 0 + 7 Combine like terms: -7 + 7 = 0 0 + -1b = 0 + 7 -1b = 0 + 7 Combine like terms: 0 + 7 = 7 -1b = 7 Divide each side by '-1'. b = -7 Simplifying b = -7

Subproblem 2

Set the factor '(12 + -1b)' equal to zero and attempt to solve: Simplifying 12 + -1b = 0 Solving 12 + -1b = 0 Move all terms containing b to the left, all other terms to the right. Add '-12' to each side of the equation. 12 + -12 + -1b = 0 + -12 Combine like terms: 12 + -12 = 0 0 + -1b = 0 + -12 -1b = 0 + -12 Combine like terms: 0 + -12 = -12 -1b = -12 Divide each side by '-1'. b = 12 Simplifying b = 12

Solution

b = {-7, 12}

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