The dimensions of a box are b, b+1, b+4. Find how fast the total surface area A increases as b increases.

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A: f(x) =7x3+8xx2-7x(iv) f(0) = ?f(x) = x7x2+8x(x-7)=7x2+8x-7f(0) =0+80-7=-87⇒ f(0)=-87(v) limx→7- f(x)...

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