exam Maths Puzzle Numerical Ability

find 2f(x) - f(x-1) for f(x)=3x^2 + 5

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exam Other Question

(6ab^2/35b)(42a/18ab) #30 ^1 3x/3+y over 1 = x/1+y

#31 ^1 2x + y/x over 1 = 2+y

#32 ^1 2a + b/a+b over 1 = 2