SOLUTION: 10r2+20r-88=-8 Could not figure out how to factor this radical out. Is it possible to have no solution?

Question 587572: 10r2+20r-88=-8
Could not figure out how to factor this radical out. Is it possible to have no solution?
Answer by ankor@dixie-net.com(22740) (Show Source): You can put this solution on YOUR website!
10r2+20r-88=-8
:
10r^2 + 20r - 88 + 8 = 0
10r^2 + 20r - 80 = 0
simplify, divide both sides by 10
r^2 + 2r - 8 = 0
Factors easily to
(r+4)(r-2) = 0
Two solutions
r = -4
r = 2
:
:
Check solutions in original equation
r= -4
10(-4^2) + 20(-4) - 88 = -8
10(16) - 80 - 88 = -8
:
You can check the r=2 solution
RELATED QUESTIONS
hi i need help with the following problem: the cubed root of 2x+7=5 (the five is not... (answered by ewatrrr)

This is not from a text book but a question my instructor posed to me. I am not sure how (answered by jim_thompson5910)

COuld someone please explain how to work the following problem out? Multiply: 8... (answered by checkley71)

could you PLEASE help me solve this trig identity. (6sin^x)-(5cosx)-(2)=0 and the range... (answered by stanbon,solver91311)

could you PLEASE help me solve this trig identity. (6sinx)-(5cosx)-(2)=0 and the range... (answered by Alan3354)

Problem #8 I have read the chapter many times and can not seem to figure it out.... (answered by rapaljer)

Mary�s age is at least five more than twice her brothers age. Is it possible for Mary to... (answered by Boreal,solver91311)

I have to use a six-step procedure to graph a rational function but I am not sure how to... (answered by stanbon)

Ok, I am having problems trying to figure out what the other 2 solutions are within this... (answered by stanbon)