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rusak2 [61]
3 years ago
5

Bailey writes the expression g2 + 14g + 40 to represent the area of a planned school garden in square feet. If g = 5, what are t

he dimensions of the school garden?
20 feet by 2 feet
10 feet by 4 feet
12 feet by 7 feet
15 feet by 9 feet
Mathematics
1 answer:
ikadub [295]3 years ago
5 0
The expression is A=g^2 + 14g + 40.
D=14^2-4\cdot 40=196-160=36 \\  \sqrt{D}=6  \\ q_{1,2}= \dfrac{-14\pm 6}{2}  =-4,-10.
Then A=g^2 + 14g + 40=(g+4)(g+10).
The width is g+4, the length is g+10.
When g=5, 
g+4=9 ft and g+10=15 ft.
Answer: correct choice is D.

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