(5r+3)(2r-6)=0

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Solution for (5r+3)(2r-6)=0 equation:


Simplifying
(5r + 3)(2r + -6) = 0

Reorder the terms:
(3 + 5r)(2r + -6) = 0

Reorder the terms:
(3 + 5r)(-6 + 2r) = 0

Multiply (3 + 5r) * (-6 + 2r)
(3(-6 + 2r) + 5r * (-6 + 2r)) = 0
((-6 * 3 + 2r * 3) + 5r * (-6 + 2r)) = 0
((-18 + 6r) + 5r * (-6 + 2r)) = 0
(-18 + 6r + (-6 * 5r + 2r * 5r)) = 0
(-18 + 6r + (-30r + 10r2)) = 0

Combine like terms: 6r + -30r = -24r
(-18 + -24r + 10r2) = 0

Solving
-18 + -24r + 10r2 = 0

Solving for variable 'r'.

Factor out the Greatest Common Factor (GCF), '2'.
2(-9 + -12r + 5r2) = 0

Factor a trinomial.
2((-3 + -5r)(3 + -1r)) = 0

Ignore the factor 2.

Subproblem 1

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

Subproblem 2

Set the factor '(3 + -1r)' equal to zero and attempt to solve: Simplifying 3 + -1r = 0 Solving 3 + -1r = 0 Move all terms containing r to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + -1r = 0 + -3 Combine like terms: 3 + -3 = 0 0 + -1r = 0 + -3 -1r = 0 + -3 Combine like terms: 0 + -3 = -3 -1r = -3 Divide each side by '-1'. r = 3 Simplifying r = 3

Solution

r = {-0.6, 3}

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