4b^2-90=-2b

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Solution for 4b^2-90=-2b equation:


Simplifying
4b2 + -90 = -2b

Reorder the terms:
-90 + 4b2 = -2b

Solving
-90 + 4b2 = -2b

Solving for variable 'b'.

Reorder the terms:
-90 + 2b + 4b2 = -2b + 2b

Combine like terms: -2b + 2b = 0
-90 + 2b + 4b2 = 0

Factor out the Greatest Common Factor (GCF), '2'.
2(-45 + b + 2b2) = 0

Factor a trinomial.
2((-5 + -1b)(9 + -2b)) = 0

Ignore the factor 2.

Subproblem 1

Set the factor '(-5 + -1b)' equal to zero and attempt to solve: Simplifying -5 + -1b = 0 Solving -5 + -1b = 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 + -1b = 0 + 5 Combine like terms: -5 + 5 = 0 0 + -1b = 0 + 5 -1b = 0 + 5 Combine like terms: 0 + 5 = 5 -1b = 5 Divide each side by '-1'. b = -5 Simplifying b = -5

Subproblem 2

Set the factor '(9 + -2b)' equal to zero and attempt to solve: Simplifying 9 + -2b = 0 Solving 9 + -2b = 0 Move all terms containing b to the left, all other terms to the right. Add '-9' to each side of the equation. 9 + -9 + -2b = 0 + -9 Combine like terms: 9 + -9 = 0 0 + -2b = 0 + -9 -2b = 0 + -9 Combine like terms: 0 + -9 = -9 -2b = -9 Divide each side by '-2'. b = 4.5 Simplifying b = 4.5

Solution

b = {-5, 4.5}

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