Math 18 - Please show work to help!

Algebra
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Oct 10th, 2015

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Thank you for the opportunity to help you with your question!

5 *r^2 = 1+2r

5 *r^2- 2r-1 =0

quadratic formula

r = [-b +- sqrt(b^2 - 4ac)]/2a

r = [2 +- sqrt(4 + 20)]/10

r = [2 +- sqrt(24)]/10

r = 2[1 +- sqrt(6)]/10

r =[1 +- sqrt(6)]/5

r=[1 - sqrt(6)]/5       or                                r =[1 + sqrt(6)]/5

r=(1 - 2.44)/5       or                                r =(1 + 2.44)/5

r = -0.289          or                              r =0.6

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Oct 10th, 2015

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