exam Maths Puzzle Numerical Ability

This is the function equation

x 2 1 -1 -2 -4
y 12 48 48 12 3

What is the function?

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exam Other Question

A master painter can paint a house in M days and two workers require W1 and W2 days each to paint a house alone. If the master can work as fast as the two workers working together, write an expression for M in terms of W1 and W2. I cant seem to get the right answer no matter how many times i try it

solve the equation by making appropriate substitution

(x)-2 - (8x)-1 + 10 = 0