-4b^2+16b+56=-9

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Solution for -4b^2+16b+56=-9 equation:


Simplifying
-4b2 + 16b + 56 = -9

Reorder the terms:
56 + 16b + -4b2 = -9

Solving
56 + 16b + -4b2 = -9

Solving for variable 'b'.

Reorder the terms:
56 + 9 + 16b + -4b2 = -9 + 9

Combine like terms: 56 + 9 = 65
65 + 16b + -4b2 = -9 + 9

Combine like terms: -9 + 9 = 0
65 + 16b + -4b2 = 0

Factor a trinomial.
(13 + -2b)(5 + 2b) = 0

Subproblem 1

Set the factor '(13 + -2b)' equal to zero and attempt to solve: Simplifying 13 + -2b = 0 Solving 13 + -2b = 0 Move all terms containing b to the left, all other terms to the right. Add '-13' to each side of the equation. 13 + -13 + -2b = 0 + -13 Combine like terms: 13 + -13 = 0 0 + -2b = 0 + -13 -2b = 0 + -13 Combine like terms: 0 + -13 = -13 -2b = -13 Divide each side by '-2'. b = 6.5 Simplifying b = 6.5

Subproblem 2

Set the factor '(5 + 2b)' equal to zero and attempt to solve: Simplifying 5 + 2b = 0 Solving 5 + 2b = 0 Move all terms containing b to the left, all other terms to the right. Add '-5' to each side of the equation. 5 + -5 + 2b = 0 + -5 Combine like terms: 5 + -5 = 0 0 + 2b = 0 + -5 2b = 0 + -5 Combine like terms: 0 + -5 = -5 2b = -5 Divide each side by '2'. b = -2.5 Simplifying b = -2.5

Solution

b = {6.5, -2.5}

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