book Maths Puzzle Numerical Ability

trying to just double check the rest of my daughters review

foiling expressions

(x+3)(x^2+3x-2) I came up with 3x^4+3-2

It does not sound right but I tried the answer my daughter has is 3x^2+3-2

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book Other Question

Draw the appropriate graphs.

A small firm produces both AM and AM/FM car radios. The AM radios take 15 h to produce, and the AM/FM radios take 20 h. The number of production hou Find the domain of f, the roots of f (x) = 0, and determine the signs of f where f (x) = x^2 -1/ square root of x + 1 + square root or x + 1 - Thank you for any help you can give