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

Question

Asked 4/10/2014 5:53:14 PM

Updated 4/10/2014 8:07:49 PM

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This conversation has been flagged as incorrect.

Flagged by yeswey [4/10/2014 8:05:07 PM]

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babkat13|Points 9|

Question

Asked 4/10/2014 5:53:14 PM

Updated 4/10/2014 8:07:49 PM

2 Answers/Comments

This conversation has been flagged as incorrect.

Flagged by yeswey [4/10/2014 8:05:07 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]

8

q^3 – q^2 + 2q – 2

= q^2(q - 1) + 2(q - 1)

= (q - 1)(q^2 + 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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