book Maths Puzzle Numerical Ability

DIFFERENCIATION:
IF Y=1/1+X,SHOW THAT
(1+X)d2y/dx2+2dy/dx=0

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i have been out of school for 12 years and need a hand on this act practice question f(x)=3xsquared+4,f(x+1)= 4x^5+10x^4-16x^2 divide by 4x^2

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