A word problem with a quadratic equation

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marywendy

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May 2, 2016
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Hi, the following problem is supposed to be easy, but I'm not able to solve it. None of the answers fits my solution of the quadratic, so I must be doing something wrong. Please help me. Here is the problem:

Mila studies plants that grow both above and below sea level. She expresses the debths and hights that a certain plant can grow with the equation x^2+16x+20=0 where x represents the number of feet above or below sea level. What are the depths that the plant can grow?
A. -2 ft; -14 ft
B. -2 ft
C. -8 ft
D. 8 ft; 2 ft

Thanks.
 
marywendy said:
Hi, the following problem is supposed to be easy, but I'm not able to solve it. None of the answers fits my solution of the quadratic, so I must be doing something wrong. Please help me. Here is the problem:

Mila studies plants that grow both above and below sea level. She expresses the debths and hights that a certain plant can grow with the equation x^2+16x+20=0 where x represents the number of feet above or below sea level. What are the depths that the plant can grow?
A. -2 ft; -14 ft
B. -2 ft
C. -8 ft
D. 8 ft; 2 ft

Thanks.
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