exam Maths Puzzle Numerical Ability

Rewrite the middle term as the sum of two terms and then factor by grouping
x^2+4x-21

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exam Other Question

Is the relation {(3,2), (1,-2), (-2,2), (-5,8)} a function? I said "Yes", but now I am worndering because of the (-2,2)? does this make it not a function? 12X^2-41X+24