exam Maths Puzzle Numerical Ability

What values for x must be excluded in the following fraction?

5/x+1

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exam Other Question

use factoring, the quadratic formula or identities to solve sec^2x+tanx=1. find all solutions on the interval [0,2pi). Find any rational roots for the equation

x to the fourth + 3x to the third- x squared-9x-6=0