6r^2+7r=-r+90+4r^2

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Solution for 6r^2+7r=-r+90+4r^2 equation:


Simplifying
6r2 + 7r = -1r + 90 + 4r2

Reorder the terms:
7r + 6r2 = -1r + 90 + 4r2

Reorder the terms:
7r + 6r2 = 90 + -1r + 4r2

Solving
7r + 6r2 = 90 + -1r + 4r2

Solving for variable 'r'.

Reorder the terms:
-90 + 7r + r + 6r2 + -4r2 = 90 + -1r + 4r2 + -90 + r + -4r2

Combine like terms: 7r + r = 8r
-90 + 8r + 6r2 + -4r2 = 90 + -1r + 4r2 + -90 + r + -4r2

Combine like terms: 6r2 + -4r2 = 2r2
-90 + 8r + 2r2 = 90 + -1r + 4r2 + -90 + r + -4r2

Reorder the terms:
-90 + 8r + 2r2 = 90 + -90 + -1r + r + 4r2 + -4r2

Combine like terms: 90 + -90 = 0
-90 + 8r + 2r2 = 0 + -1r + r + 4r2 + -4r2
-90 + 8r + 2r2 = -1r + r + 4r2 + -4r2

Combine like terms: -1r + r = 0
-90 + 8r + 2r2 = 0 + 4r2 + -4r2
-90 + 8r + 2r2 = 4r2 + -4r2

Combine like terms: 4r2 + -4r2 = 0
-90 + 8r + 2r2 = 0

Factor out the Greatest Common Factor (GCF), '2'.
2(-45 + 4r + r2) = 0

Factor a trinomial.
2((-9 + -1r)(5 + -1r)) = 0

Ignore the factor 2.

Subproblem 1

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

Subproblem 2

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

Solution

r = {-9, 5}

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