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

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


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

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

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

Multiply (-2 + 4r) * (4 + 5r)
(-2(4 + 5r) + 4r * (4 + 5r)) = 0
((4 * -2 + 5r * -2) + 4r * (4 + 5r)) = 0
((-8 + -10r) + 4r * (4 + 5r)) = 0
(-8 + -10r + (4 * 4r + 5r * 4r)) = 0
(-8 + -10r + (16r + 20r2)) = 0

Combine like terms: -10r + 16r = 6r
(-8 + 6r + 20r2) = 0

Solving
-8 + 6r + 20r2 = 0

Solving for variable 'r'.

Factor out the Greatest Common Factor (GCF), '2'.
2(-4 + 3r + 10r2) = 0

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

Ignore the factor 2.

Subproblem 1

Set the factor '(-4 + -5r)' equal to zero and attempt to solve: Simplifying -4 + -5r = 0 Solving -4 + -5r = 0 Move all terms containing r to the left, all other terms to the right. Add '4' to each side of the equation. -4 + 4 + -5r = 0 + 4 Combine like terms: -4 + 4 = 0 0 + -5r = 0 + 4 -5r = 0 + 4 Combine like terms: 0 + 4 = 4 -5r = 4 Divide each side by '-5'. r = -0.8 Simplifying r = -0.8

Subproblem 2

Set the factor '(1 + -2r)' equal to zero and attempt to solve: Simplifying 1 + -2r = 0 Solving 1 + -2r = 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 + -2r = 0 + -1 Combine like terms: 1 + -1 = 0 0 + -2r = 0 + -1 -2r = 0 + -1 Combine like terms: 0 + -1 = -1 -2r = -1 Divide each side by '-2'. r = 0.5 Simplifying r = 0.5

Solution

r = {-0.8, 0.5}

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