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The width,w, of a rectangular garden is X -2 the area of the garden is X^3-2X-4 what is an expression for the length of the garden?
A. X^2-2x-2
B. X^2+2x-2
C. X^2-2x+2
D. X^2+2x+2

Sagot :

Naǫidn
[tex]A=wl \Rightarrow l=\frac{A}{w}[/tex]
l - length, A - area, w - width

[tex]A=x^3-2x-4 \\ w=x-2 \\ \\ l=\frac{x^3-2x-4}{x-2}=\frac{x^3-2x^2+2x^2-4x+2x-4}{x-2}=\frac{x^2(x-2)+2x(x-2)+2(x-2)}{x-2}=\\ =\frac{(x^2+2x+2)(x-2)}{x-2}=x^2+2x+2[/tex]

The answer is D.
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