SOLUTION: I apologize for having to ask two questions but they are the only two that I'm totally stumped on. I appreciate your help very, very much!! This also is a quadratic function.

Question 168650This question is from textbook Intermediate Algebra
: I apologize for having to ask two questions but they are the only two that I'm totally stumped on. I appreciate your help very, very much!! This also is a quadratic function.

"Solve each equation for the indicated variable"
Solve for r This question is from textbook Intermediate Algebra

Found 2 solutions by Alan3354, stanbon:
Answer by Alan3354(69443) (Show Source): You can put this solution on YOUR website!
Solve for r
-------------------

Factor it
(4r - 5pc)*(3r + 2pc) = 0
r = 5pc/4
r = -2pc/3

Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
10p^2c^2 + 7pcr = 12r^2
12r^2 - 7pcr - 10p^2c^2 = 0
Use the quadratic formula:
----------------------------
r = [7pc +- sqrt(49p^2c^2 - 4*12*-10p^2c^2)]/24
r = [7pc +- sqrt(529p^2c^2)]/24
r = [7pc +- 23pc]/24
r = [30pc]/24 or r = [-16pc]/24
r = [15/12]pc or [-2/3]pc
===============================
Cheers,
Stan H.
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