exam Maths Puzzle Numerical Ability

find function f such that g(x)= 1/x-5
h=g o f, and h(x)=1/(x^2-5)

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How would I write the equation of a line that has slope -3 and contain the point(4,2).express final equation in standard form. Showing me how to solve this would be of great assistance.

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Brina please help with the following equation.It is asking about the DEGREE,DOMAIN,RANGE, Y-INT,BEHAVIOR,POTENTIAL ZEROS, TURNING POINTS, DESCARTES RULE,REAL ZEROS. f(x)=X^4+4X^3-X^2-16X