SOLUTION: 18. Solve for the indicated letter.
Solve the formula
S = 1/3 πr2h + 4πrh for r.
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Question 315592: 18. Solve for the indicated letter.
Solve the formula
S = 1/3 πr2h + 4πrh for r.
Answer by ankor@dixie-net.com(22740) (Show Source): You can put this solution on YOUR website!
18.Solve for the indicated letter.
Solve the formula.
S = for r.
:
= S
Multiply by 3
= 3S
:
= 3S
Factor out pi*h
pi*h(r^2 + 12r) = 3S
:
divide both sides by
r^2 + 12r =
:
Arrange as a quadratic equation
r^2 + 12r - () = 0
:
Solve for r using the quadratic formula
:
In this equation: x = r a=1; b=12; c=-
:
:
; I think only the positive solution is wanted here
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