2r(3r+5)(4r+5)=0

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Solution for 2r(3r+5)(4r+5)=0 equation:


Simplifying
2r(3r + 5)(4r + 5) = 0

Reorder the terms:
2r(5 + 3r)(4r + 5) = 0

Reorder the terms:
2r(5 + 3r)(5 + 4r) = 0

Multiply (5 + 3r) * (5 + 4r)
2r(5(5 + 4r) + 3r * (5 + 4r)) = 0
2r((5 * 5 + 4r * 5) + 3r * (5 + 4r)) = 0
2r((25 + 20r) + 3r * (5 + 4r)) = 0
2r(25 + 20r + (5 * 3r + 4r * 3r)) = 0
2r(25 + 20r + (15r + 12r2)) = 0

Combine like terms: 20r + 15r = 35r
2r(25 + 35r + 12r2) = 0
(25 * 2r + 35r * 2r + 12r2 * 2r) = 0
(50r + 70r2 + 24r3) = 0

Solving
50r + 70r2 + 24r3 = 0

Solving for variable 'r'.

Factor out the Greatest Common Factor (GCF), '2r'.
2r(25 + 35r + 12r2) = 0

Factor a trinomial.
2r((5 + 3r)(5 + 4r)) = 0

Ignore the factor 2.

Subproblem 1

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

Subproblem 2

Set the factor '(5 + 3r)' equal to zero and attempt to solve: Simplifying 5 + 3r = 0 Solving 5 + 3r = 0 Move all terms containing r to the left, all other terms to the right. Add '-5' to each side of the equation. 5 + -5 + 3r = 0 + -5 Combine like terms: 5 + -5 = 0 0 + 3r = 0 + -5 3r = 0 + -5 Combine like terms: 0 + -5 = -5 3r = -5 Divide each side by '3'. r = -1.666666667 Simplifying r = -1.666666667

Subproblem 3

Set the factor '(5 + 4r)' equal to zero and attempt to solve: Simplifying 5 + 4r = 0 Solving 5 + 4r = 0 Move all terms containing r to the left, all other terms to the right. Add '-5' to each side of the equation. 5 + -5 + 4r = 0 + -5 Combine like terms: 5 + -5 = 0 0 + 4r = 0 + -5 4r = 0 + -5 Combine like terms: 0 + -5 = -5 4r = -5 Divide each side by '4'. r = -1.25 Simplifying r = -1.25

Solution

r = {0, -1.666666667, -1.25}

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