4b(4b+5)(5b-3)=0

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Solution for 4b(4b+5)(5b-3)=0 equation:


Simplifying
4b(4b + 5)(5b + -3) = 0

Reorder the terms:
4b(5 + 4b)(5b + -3) = 0

Reorder the terms:
4b(5 + 4b)(-3 + 5b) = 0

Multiply (5 + 4b) * (-3 + 5b)
4b(5(-3 + 5b) + 4b * (-3 + 5b)) = 0
4b((-3 * 5 + 5b * 5) + 4b * (-3 + 5b)) = 0
4b((-15 + 25b) + 4b * (-3 + 5b)) = 0
4b(-15 + 25b + (-3 * 4b + 5b * 4b)) = 0
4b(-15 + 25b + (-12b + 20b2)) = 0

Combine like terms: 25b + -12b = 13b
4b(-15 + 13b + 20b2) = 0
(-15 * 4b + 13b * 4b + 20b2 * 4b) = 0
(-60b + 52b2 + 80b3) = 0

Solving
-60b + 52b2 + 80b3 = 0

Solving for variable 'b'.

Factor out the Greatest Common Factor (GCF), '4b'.
4b(-15 + 13b + 20b2) = 0

Factor a trinomial.
4b((-5 + -4b)(3 + -5b)) = 0

Ignore the factor 4.

Subproblem 1

Set the factor 'b' equal to zero and attempt to solve: Simplifying b = 0 Solving b = 0 Move all terms containing b to the left, all other terms to the right. Simplifying b = 0

Subproblem 2

Set the factor '(-5 + -4b)' equal to zero and attempt to solve: Simplifying -5 + -4b = 0 Solving -5 + -4b = 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 + -4b = 0 + 5 Combine like terms: -5 + 5 = 0 0 + -4b = 0 + 5 -4b = 0 + 5 Combine like terms: 0 + 5 = 5 -4b = 5 Divide each side by '-4'. b = -1.25 Simplifying b = -1.25

Subproblem 3

Set the factor '(3 + -5b)' equal to zero and attempt to solve: Simplifying 3 + -5b = 0 Solving 3 + -5b = 0 Move all terms containing b to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + -5b = 0 + -3 Combine like terms: 3 + -3 = 0 0 + -5b = 0 + -3 -5b = 0 + -3 Combine like terms: 0 + -3 = -3 -5b = -3 Divide each side by '-5'. b = 0.6 Simplifying b = 0.6

Solution

b = {0, -1.25, 0.6}

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