r^2=40-3r

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Solution for r^2=40-3r equation:


Simplifying
r2 = 40 + -3r

Solving
r2 = 40 + -3r

Solving for variable 'r'.

Reorder the terms:
-40 + 3r + r2 = 40 + -3r + -40 + 3r

Reorder the terms:
-40 + 3r + r2 = 40 + -40 + -3r + 3r

Combine like terms: 40 + -40 = 0
-40 + 3r + r2 = 0 + -3r + 3r
-40 + 3r + r2 = -3r + 3r

Combine like terms: -3r + 3r = 0
-40 + 3r + r2 = 0

Factor a trinomial.
(-8 + -1r)(5 + -1r) = 0

Subproblem 1

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

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 = {-8, 5}

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