Nicolas9979
25.08.2019 •
Mathematics
If the width of a rectangular piece of wood is x + 2 inches long and the length is three times as long with an additional inch added, what is the area of the wood?
a. 3x² + 12x + 12
b. 3x² + 12x + 14
c. 3x² – 13x + 14
d. 3x² + 13x + 14
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Ответ:
A = 3(x + 2)(x + 2)
A = 3(x(x + 2) + 2(x + 2)
A = 3(x(x) + x(2) + 2(x) + 2(2))
A = 3(x² + 2x + 2x + 4)
A = 3(x² + 4x + 4)
A = 3(x²) + 3(4x) + 3(4)
A = 3x² + 12x + 12
The answer is A.
Ответ: