(7-r)(6-r)=6

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Solution for (7-r)(6-r)=6 equation:


Simplifying
(7 + -1r)(6 + -1r) = 6

Multiply (7 + -1r) * (6 + -1r)
(7(6 + -1r) + -1r * (6 + -1r)) = 6
((6 * 7 + -1r * 7) + -1r * (6 + -1r)) = 6
((42 + -7r) + -1r * (6 + -1r)) = 6
(42 + -7r + (6 * -1r + -1r * -1r)) = 6
(42 + -7r + (-6r + 1r2)) = 6

Combine like terms: -7r + -6r = -13r
(42 + -13r + 1r2) = 6

Solving
42 + -13r + 1r2 = 6

Solving for variable 'r'.

Reorder the terms:
42 + -6 + -13r + 1r2 = 6 + -6

Combine like terms: 42 + -6 = 36
36 + -13r + 1r2 = 6 + -6

Combine like terms: 6 + -6 = 0
36 + -13r + 1r2 = 0

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

Subproblem 1

Set the factor '(4 + -1r)' equal to zero and attempt to solve: Simplifying 4 + -1r = 0 Solving 4 + -1r = 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 + -1r = 0 + -4 Combine like terms: 4 + -4 = 0 0 + -1r = 0 + -4 -1r = 0 + -4 Combine like terms: 0 + -4 = -4 -1r = -4 Divide each side by '-1'. r = 4 Simplifying r = 4

Subproblem 2

Set the factor '(9 + -1r)' equal to zero and attempt to solve: Simplifying 9 + -1r = 0 Solving 9 + -1r = 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 + -1r = 0 + -9 Combine like terms: 9 + -9 = 0 0 + -1r = 0 + -9 -1r = 0 + -9 Combine like terms: 0 + -9 = -9 -1r = -9 Divide each side by '-1'. r = 9 Simplifying r = 9

Solution

r = {4, 9}

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