exam Maths Puzzle Numerical Ability

fill in the missing....
x to the 3rd + 216 = ( ) (x to the 2nd - 6x + 36)

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exam Other Question

The cost of producing a number of items x is given by
, in which b is the fixed cost and m is the variable cost (the cost of producing one more item).

(a) If the fixed cost insert one set of parentheses in the expression 2n-3+4n+6n+1 so that it is equivalent to 12n-5.