book Maths Puzzle Numerical Ability

how do i solve f(x)=3(x-3)^2+4

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The combined area of a square and a rectangle is 64 square centimeters. The width of the rectangle is 2 centimeters more that the lenght of the square, and the length of the rectan Im stuck on what to do after this part. please help! thanks!

2(x-2)=2+10
2x-4=2x+10