(13r+9)(4r-12)=0

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Solution for (13r+9)(4r-12)=0 equation:


Simplifying
(13r + 9)(4r + -12) = 0

Reorder the terms:
(9 + 13r)(4r + -12) = 0

Reorder the terms:
(9 + 13r)(-12 + 4r) = 0

Multiply (9 + 13r) * (-12 + 4r)
(9(-12 + 4r) + 13r * (-12 + 4r)) = 0
((-12 * 9 + 4r * 9) + 13r * (-12 + 4r)) = 0
((-108 + 36r) + 13r * (-12 + 4r)) = 0
(-108 + 36r + (-12 * 13r + 4r * 13r)) = 0
(-108 + 36r + (-156r + 52r2)) = 0

Combine like terms: 36r + -156r = -120r
(-108 + -120r + 52r2) = 0

Solving
-108 + -120r + 52r2 = 0

Solving for variable 'r'.

Factor out the Greatest Common Factor (GCF), '4'.
4(-27 + -30r + 13r2) = 0

Factor a trinomial.
4((-9 + -13r)(3 + -1r)) = 0

Ignore the factor 4.

Subproblem 1

Set the factor '(-9 + -13r)' equal to zero and attempt to solve: Simplifying -9 + -13r = 0 Solving -9 + -13r = 0 Move all terms containing r to the left, all other terms to the right. Add '9' to each side of the equation. -9 + 9 + -13r = 0 + 9 Combine like terms: -9 + 9 = 0 0 + -13r = 0 + 9 -13r = 0 + 9 Combine like terms: 0 + 9 = 9 -13r = 9 Divide each side by '-13'. r = -0.6923076923 Simplifying r = -0.6923076923

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 = {-0.6923076923, 3}

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