SOLUTION: solve for r:r(3r + 2) = 3r(1 +r) + 12.

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Question 1028210: solve for r:r(3r + 2) = 3r(1 +r) + 12.
Answer by ankor@dixie-net.com(22740) About Me  (Show Source):
You can put this solution on YOUR website!
solve for r: r(3r + 2) = 3r(1 +r) + 12.
Distribute
3r^2 + 2r = 3r + 3r^2 + 12
subtract 3r^2 from both sides
2r = 3r + 12
2r - 3r = 12
-r = 12
multiply both sides by -1
r = -12
:
:
Check this out in the original equation
-12(3(-12) + 2) = 3(-12)(1 - 12) + 12
-12(-36 + 2) = -36(-11) + 12
-12(-34) = 396 + 12
408 = 408; confirms our solution