(r-5)(r-7)=0

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Solution for (r-5)(r-7)=0 equation:


Simplifying
(r + -5)(r + -7) = 0

Reorder the terms:
(-5 + r)(r + -7) = 0

Reorder the terms:
(-5 + r)(-7 + r) = 0

Multiply (-5 + r) * (-7 + r)
(-5(-7 + r) + r(-7 + r)) = 0
((-7 * -5 + r * -5) + r(-7 + r)) = 0
((35 + -5r) + r(-7 + r)) = 0
(35 + -5r + (-7 * r + r * r)) = 0
(35 + -5r + (-7r + r2)) = 0

Combine like terms: -5r + -7r = -12r
(35 + -12r + r2) = 0

Solving
35 + -12r + r2 = 0

Solving for variable 'r'.

Factor a trinomial.
(5 + -1r)(7 + -1r) = 0

Subproblem 1

Set the factor '(5 + -1r)' equal to zero and attempt to solve: Simplifying 5 + -1r = 0 Solving 5 + -1r = 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 + -1r = 0 + -5 Combine like terms: 5 + -5 = 0 0 + -1r = 0 + -5 -1r = 0 + -5 Combine like terms: 0 + -5 = -5 -1r = -5 Divide each side by '-1'. r = 5 Simplifying r = 5

Subproblem 2

Set the factor '(7 + -1r)' equal to zero and attempt to solve: Simplifying 7 + -1r = 0 Solving 7 + -1r = 0 Move all terms containing r to the left, all other terms to the right. Add '-7' to each side of the equation. 7 + -7 + -1r = 0 + -7 Combine like terms: 7 + -7 = 0 0 + -1r = 0 + -7 -1r = 0 + -7 Combine like terms: 0 + -7 = -7 -1r = -7 Divide each side by '-1'. r = 7 Simplifying r = 7

Solution

r = {5, 7}

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