Homework Help: math

Posted by Krystal.T on Saturday, June 23, 2012 at 12:16pm.

A rectangular block is 2 cm wider than it is high and twice as long as it it wide. Let x cm be the height of the block.
Find an expression for the total surface area, A cm2, in term of x.

math - MathMate, Saturday, June 23, 2012 at 5:42pm
Let L,W and H be the dimensions of the rectangular block.

Total surface area
A=2(LW+WH+HL)

So if
H=height=x
then
W=x+2, and
L=2W=2(x+2)
Substitute these values of H,W and L into the equation for A and simplify.

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