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A cuboid has a volume given by

V(x)=x3+9x2+23x+15

The height of the cuboid is x+5.

Cuboid of height x+5

Find an expression, in terms of x, for the area of the base of the cuboid.


If A is the area of the base, then

V=A(x+5)

Rearrange to make A the subject and use long division.