Find the possible value or values of r in the quadratic equation r2 – 7r – 8 = 0. A. r = 6 , r = 6 C. r = –10, r = 3
B. r= 32,r=5 D. r=8,r=–1

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

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Asked 4/10/2014 5:32:17 PM

Updated 4/10/2014 8:13:36 PM

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r^2 – 7r – 8 = 0

(r + 1)(r - 8) =0

r = -1 or 8

(r + 1)(r - 8) =0

r = -1 or 8

Added 4/10/2014 8:13:36 PM

This answer has been confirmed as correct and helpful.

Confirmed by jeifunk [4/10/2014 8:24:11 PM]

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Updated 4/8/2014 11:18:21 PM

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20. Find the value or values of y in the quadratic equation y2 + 4y + 4 = 7.
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Updated 4/10/2014 8:07:49 PM

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y^2 + 4y + 4 = 7

y^2 + 4y - 3 = 0

a = 1, b = 4, c = -3

b^2 - 4ac = 4^2 - 4(1)(-3) = 28

y = (-4 + sqrt28)/2 = -2 + sqrt 7

or y = (-4 - sqrt28)/2 = -2 - sqrt 7

y^2 + 4y - 3 = 0

a = 1, b = 4, c = -3

b^2 - 4ac = 4^2 - 4(1)(-3) = 28

y = (-4 + sqrt28)/2 = -2 + sqrt 7

or y = (-4 - sqrt28)/2 = -2 - sqrt 7

Added 4/10/2014 8:06:49 PM

This answer has been confirmed as correct and helpful.

Confirmed by jeifunk [4/10/2014 8:11:21 PM]

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