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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
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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Questions asked by the same visitor
20. In a right triangle, one leg measures 4 inches and the other leg measures 6 inches. What is the length of the hypotenuse? A. 10 inches B. 52 inches C. 52 inches D. 2 13 inches
Weegy: True. A triangle has a hypotenuse only if it is a right triangle (More)
Question
Expert Answered
Updated 4/8/2014 11:18:21 PM
1 Answer/Comment
The length of the hypotenuse = sqrt(4^2 + 6^2) = sqrt(52) = 2 sqrt13 inches.
Added 4/8/2014 11:18:21 PM
This answer has been confirmed as correct and helpful.
Confirmed by jeifunk [4/8/2014 11:19:52 PM]
20. Find the value or values of y in the quadratic equation y2 + 4y + 4 = 7. A. y=2,y=7 C. y=–2 7,y=2 7 B. y=2+2 7,y=2–2 7 D. y=–2+ 7,y=–2– 7
Weegy: 1 User: 6. Which of the following are the factors of q3 – q2 + 2q – 2? A. (q2 –1)(q+2) B. (q–1)(q2 +2) C. (q–1)(2–q) D. (q–1)(2–q2) (More)
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Updated 4/10/2014 8:07:49 PM
2 Answers/Comments
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
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]
q^3 – q^2 + 2q – 2
= q^2(q - 1) + 2(q - 1)
= (q - 1)(q^2 + 2)
Added 4/10/2014 8:07:49 PM
This answer has been confirmed as correct and helpful.
Confirmed by jeifunk [4/10/2014 8:11:24 PM]
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