20b^2-40b=25

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Solution for 20b^2-40b=25 equation:


Simplifying
20b2 + -40b = 25

Reorder the terms:
-40b + 20b2 = 25

Solving
-40b + 20b2 = 25

Solving for variable 'b'.

Reorder the terms:
-25 + -40b + 20b2 = 25 + -25

Combine like terms: 25 + -25 = 0
-25 + -40b + 20b2 = 0

Factor out the Greatest Common Factor (GCF), '5'.
5(-5 + -8b + 4b2) = 0

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

Ignore the factor 5.

Subproblem 1

Set the factor '(-1 + -2b)' equal to zero and attempt to solve: Simplifying -1 + -2b = 0 Solving -1 + -2b = 0 Move all terms containing b to the left, all other terms to the right. Add '1' to each side of the equation. -1 + 1 + -2b = 0 + 1 Combine like terms: -1 + 1 = 0 0 + -2b = 0 + 1 -2b = 0 + 1 Combine like terms: 0 + 1 = 1 -2b = 1 Divide each side by '-2'. b = -0.5 Simplifying b = -0.5

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 = {-0.5, 2.5}

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