exam Maths Puzzle Numerical Ability

How do I simplify this 1/x - 1/b over 1/xb + 1/2

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exam Other Question

Factor completely:
x^2 - 7x - 8

My answer: prime (no common factors)

I am not sure this is correct, I am just now learning the factoring process, could someone please check my answer and possibly help?

Milliron
P(4,0), m= -0.6

the problem asks me to find the equation in standard form using these points and the slope