book Maths Puzzle Numerical Ability

A student thinks that the expression (a+b)2 and a2+b2 are equal to one another. How would you explain to the student why this is not so?

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The volume of a box is 3p^4 + 16p^3 + 21p^2. The height is p, and the width is p + 3. What is the length? My teacher is moving me up to Algebra, and I know anything. If you could give me a list of sites with good algebra games, ect that'd be awesome