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What is the length of the rectangle whose area is x^2 – 3x – 4 and whose width is x + 1? 

A. x+4

B. x-4

C. x-3

D. x+3

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Sagot :

A=lw
l=A/w
l=x^2-3x-4/x+1
l= x-4

The answer is B

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