exam Maths Puzzle Numerical Ability

find the lowest common denominator of 3/x +7/5x but not adding the fraction?

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exam Other Question

Quartics using P(X) = af(b(x-c)+d
Recall Q(X) = (x-2)(x-1)(x+1)(x+2)
a)Choosing a
(i) Rewrite Q(x) for a. Let b = 1, c = 0 and d = 0
(ii) Make 3 copies of the same function on i dont understand this problem at all! please help me! log7(bottom of the g)49=x