exam Maths Puzzle Numerical Ability

Why do you factor a quadratic equasion before you solve?

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exam Other Question

how do you find the graph of best fit with the points of (1/4,5), (1/2,10), (1,15), (2,24), (6,40), (8,48), (10,56), (14,72), (18,90), (20,94), (21,101) Find the inverse of the relation {(4,2),(-1,5),(2,3)} Please!