(r-9)(6r+7)=0

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Solution for (r-9)(6r+7)=0 equation:


Simplifying
(r + -9)(6r + 7) = 0

Reorder the terms:
(-9 + r)(6r + 7) = 0

Reorder the terms:
(-9 + r)(7 + 6r) = 0

Multiply (-9 + r) * (7 + 6r)
(-9(7 + 6r) + r(7 + 6r)) = 0
((7 * -9 + 6r * -9) + r(7 + 6r)) = 0
((-63 + -54r) + r(7 + 6r)) = 0
(-63 + -54r + (7 * r + 6r * r)) = 0
(-63 + -54r + (7r + 6r2)) = 0

Combine like terms: -54r + 7r = -47r
(-63 + -47r + 6r2) = 0

Solving
-63 + -47r + 6r2 = 0

Solving for variable 'r'.

Factor a trinomial.
(-7 + -6r)(9 + -1r) = 0

Subproblem 1

Set the factor '(-7 + -6r)' equal to zero and attempt to solve: Simplifying -7 + -6r = 0 Solving -7 + -6r = 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 + -6r = 0 + 7 Combine like terms: -7 + 7 = 0 0 + -6r = 0 + 7 -6r = 0 + 7 Combine like terms: 0 + 7 = 7 -6r = 7 Divide each side by '-6'. r = -1.166666667 Simplifying r = -1.166666667

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 = {-1.166666667, 9}

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