5r(4r-1)(r+2)=0

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Solution for 5r(4r-1)(r+2)=0 equation:


Simplifying
5r(4r + -1)(r + 2) = 0

Reorder the terms:
5r(-1 + 4r)(r + 2) = 0

Reorder the terms:
5r(-1 + 4r)(2 + r) = 0

Multiply (-1 + 4r) * (2 + r)
5r(-1(2 + r) + 4r * (2 + r)) = 0
5r((2 * -1 + r * -1) + 4r * (2 + r)) = 0
5r((-2 + -1r) + 4r * (2 + r)) = 0
5r(-2 + -1r + (2 * 4r + r * 4r)) = 0
5r(-2 + -1r + (8r + 4r2)) = 0

Combine like terms: -1r + 8r = 7r
5r(-2 + 7r + 4r2) = 0
(-2 * 5r + 7r * 5r + 4r2 * 5r) = 0
(-10r + 35r2 + 20r3) = 0

Solving
-10r + 35r2 + 20r3 = 0

Solving for variable 'r'.

Factor out the Greatest Common Factor (GCF), '5r'.
5r(-2 + 7r + 4r2) = 0

Factor a trinomial.
5r((-2 + -1r)(1 + -4r)) = 0

Ignore the factor 5.

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

Subproblem 3

Set the factor '(1 + -4r)' equal to zero and attempt to solve: Simplifying 1 + -4r = 0 Solving 1 + -4r = 0 Move all terms containing r to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + -4r = 0 + -1 Combine like terms: 1 + -1 = 0 0 + -4r = 0 + -1 -4r = 0 + -1 Combine like terms: 0 + -1 = -1 -4r = -1 Divide each side by '-4'. r = 0.25 Simplifying r = 0.25

Solution

r = {0, -2, 0.25}

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