Find the possible value or values of r in the quadratic equation r2 – 7r

Education & Reference by Anonymous 2018-06-25 19:43:16

Social Science

Find the possible value or values of r in the quadratic equation r2 – 7r – 8 = 0.?

6 answers

Anonymous

no
Anonymous

8,-1
Anonymous

r^2 – 7r – 8 = 0 r^2 – 8r + r – 8 = 0 (r – 8)(r + 1) = 0 Solutions: r = – 1 r = 8
Anonymous

r^2 - 7r - 8 = 0 (r - 8)(r + 1) = 0 r = 8 or r = -1
Anonymous

r² - 7r - 8 = 0 Quadratic formula r = [7 ± √(7² – 4·1(-8))] / [2·1] = [7 ± √81] / 2 = [7 ± 9] /2 = -1, 8
Anonymous

r^2 – 7r – 8 = 0 (r – 8) (r + 1) = 0 r = -1, 8