(9-8r)(10-4r)=0

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Solution for (9-8r)(10-4r)=0 equation:


Simplifying
(9 + -8r)(10 + -4r) = 0

Multiply (9 + -8r) * (10 + -4r)
(9(10 + -4r) + -8r * (10 + -4r)) = 0
((10 * 9 + -4r * 9) + -8r * (10 + -4r)) = 0
((90 + -36r) + -8r * (10 + -4r)) = 0
(90 + -36r + (10 * -8r + -4r * -8r)) = 0
(90 + -36r + (-80r + 32r2)) = 0

Combine like terms: -36r + -80r = -116r
(90 + -116r + 32r2) = 0

Solving
90 + -116r + 32r2 = 0

Solving for variable 'r'.

Factor out the Greatest Common Factor (GCF), '2'.
2(45 + -58r + 16r2) = 0

Factor a trinomial.
2((9 + -8r)(5 + -2r)) = 0

Ignore the factor 2.

Subproblem 1

Set the factor '(9 + -8r)' equal to zero and attempt to solve: Simplifying 9 + -8r = 0 Solving 9 + -8r = 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 + -8r = 0 + -9 Combine like terms: 9 + -9 = 0 0 + -8r = 0 + -9 -8r = 0 + -9 Combine like terms: 0 + -9 = -9 -8r = -9 Divide each side by '-8'. r = 1.125 Simplifying r = 1.125

Subproblem 2

Set the factor '(5 + -2r)' equal to zero and attempt to solve: Simplifying 5 + -2r = 0 Solving 5 + -2r = 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 + -2r = 0 + -5 Combine like terms: 5 + -5 = 0 0 + -2r = 0 + -5 -2r = 0 + -5 Combine like terms: 0 + -5 = -5 -2r = -5 Divide each side by '-2'. r = 2.5 Simplifying r = 2.5

Solution

r = {1.125, 2.5}

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