book Maths Puzzle Numerical Ability

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

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book Other Question

The sum of 5 and a negative integer is greater than -4 and less than 0. How many possible negative intergers satisfy the information? Sum the polynomials 2x^2 - 3x - 4, 2x - 5 and 3x^3 + 2x^2 - 6.