2*r^2+20*r=288

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Solution for 2*r^2+20*r=288 equation:


Simplifying
2r2 + 20r = 288

Reorder the terms:
20r + 2r2 = 288

Solving
20r + 2r2 = 288

Solving for variable 'r'.

Reorder the terms:
-288 + 20r + 2r2 = 288 + -288

Combine like terms: 288 + -288 = 0
-288 + 20r + 2r2 = 0

Factor out the Greatest Common Factor (GCF), '2'.
2(-144 + 10r + r2) = 0

Factor a trinomial.
2((-18 + -1r)(8 + -1r)) = 0

Ignore the factor 2.

Subproblem 1

Set the factor '(-18 + -1r)' equal to zero and attempt to solve: Simplifying -18 + -1r = 0 Solving -18 + -1r = 0 Move all terms containing r to the left, all other terms to the right. Add '18' to each side of the equation. -18 + 18 + -1r = 0 + 18 Combine like terms: -18 + 18 = 0 0 + -1r = 0 + 18 -1r = 0 + 18 Combine like terms: 0 + 18 = 18 -1r = 18 Divide each side by '-1'. r = -18 Simplifying r = -18

Subproblem 2

Set the factor '(8 + -1r)' equal to zero and attempt to solve: Simplifying 8 + -1r = 0 Solving 8 + -1r = 0 Move all terms containing r to the left, all other terms to the right. Add '-8' to each side of the equation. 8 + -8 + -1r = 0 + -8 Combine like terms: 8 + -8 = 0 0 + -1r = 0 + -8 -1r = 0 + -8 Combine like terms: 0 + -8 = -8 -1r = -8 Divide each side by '-1'. r = 8 Simplifying r = 8

Solution

r = {-18, 8}

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