exam Maths Puzzle Numerical Ability

n(n2-1n)+n(n-1) trying to help my daughter, no idea how to solve this. the 2 is n squared.
thanks for your help

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exam Other Question

Factor these ?

4x^2 -12x -40

2x^2 -16x +30 Sally bought 3 chocolate bars and a pack of gum and paid $1.75. Jake bought 2 chocolate bars and 4 packs of gum and paid $2.00. Find the cost of a chocolate bar and the cost of a pack of gum.