7r^2+61r-90=0

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Solution for 7r^2+61r-90=0 equation:


Simplifying
7r2 + 61r + -90 = 0

Reorder the terms:
-90 + 61r + 7r2 = 0

Solving
-90 + 61r + 7r2 = 0

Solving for variable 'r'.

Factor a trinomial.
(-10 + -1r)(9 + -7r) = 0

Subproblem 1

Set the factor '(-10 + -1r)' equal to zero and attempt to solve: Simplifying -10 + -1r = 0 Solving -10 + -1r = 0 Move all terms containing r to the left, all other terms to the right. Add '10' to each side of the equation. -10 + 10 + -1r = 0 + 10 Combine like terms: -10 + 10 = 0 0 + -1r = 0 + 10 -1r = 0 + 10 Combine like terms: 0 + 10 = 10 -1r = 10 Divide each side by '-1'. r = -10 Simplifying r = -10

Subproblem 2

Set the factor '(9 + -7r)' equal to zero and attempt to solve: Simplifying 9 + -7r = 0 Solving 9 + -7r = 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 + -7r = 0 + -9 Combine like terms: 9 + -9 = 0 0 + -7r = 0 + -9 -7r = 0 + -9 Combine like terms: 0 + -9 = -9 -7r = -9 Divide each side by '-7'. r = 1.285714286 Simplifying r = 1.285714286

Solution

r = {-10, 1.285714286}

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