exam Maths Puzzle Numerical Ability

If f(x)=3x 2nd power+2, then what is f(a+b)?

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please help.find the length and width of rectangle ABCD . Toop left A top right D bottom left B bottom right C .between B and C is P=140 cm. between D and C is x.Thanks for helpin How can I Solve 25(2x+1)^2/9=0 ?