exam Maths Puzzle Numerical Ability

A rectangle has an area of 17 square meters. Find a function that models its perimeter P in terms of the length x of one of its sides.

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#37
solve

5(x-2)^2=3

#39
Explain if the following trinomial is a perfect square or if its not a perfect square: x^2-6x+9

#40
solve
x^2+7x+2=0 A sum of $3,500 is invested in two parts. One part brings a return of 5% and the other a return of 8%. The total annual return is $250. Find the amount invested at each rate.