SOLUTION: Can someone please help solve for r? r=_

SOLUTION: Can someone please help solve for r? r=__ r^2+3*r=8

Question 407298: Can someone please help solve for r?
r=__
r^2+3*r=8
Answer by jim_thompson5910(35256) (Show Source): You can put this solution on YOUR website!
Start with the given equation.

Subtract 8 from both sides.

Notice we have a quadratic equation in the form of where , , and

Let's use the quadratic formula to solve for r

Start with the quadratic formula

Plug in , , and

Square to get .

Multiply to get

Rewrite as

Add to to get

Multiply and to get .

or Break up the expression.

So the answers are or

If you need more help, email me at jim_thompson5910@hotmail.com

Also, please consider visiting my website: http://www.freewebs.com/jimthompson5910/home.html and making a donation. Thank you

Jim
RELATED QUESTIONS
Please help me solve for R for this equation: {{{(3/(5+R)) + (R/(R+2))=(R+4)/(R+5)... (answered by rmromero)

can someone please help me with this problem: Solve the equation for s. 3 - r =... (answered by nabla)

Solve for r... (answered by richwmiller)

Please help me solve for R for this equation: {{{(R/(R+1)) + 2=(3R)/(R+2)... (answered by ankor@dixie-net.com)

solve for r r+1/3=8 (answered by rfer)

solve for r... (answered by solver91311)

Can you please help me solve 60= [400/(1+r)^3 for... (answered by ankor@dixie-net.com)

Please help me solve this equation: 1/R = 1/r^1 + 1/r^2 for... (answered by stanbon)

Please help solve:... (answered by jim_thompson5910)