# Math

posted by Alex

Simplify each expression and state any non-permissible values. ( 3 marks - show your work)

x/(x^2-3x-4)-4/(x+1)

1. Steve

x^2-3x-4 = (x-4)(x+1)
So, you have

x/[(x-4)(x+1)] - 4/(x+1)
(x - 4(x-4))/[(x-4)(x+1)]
(16-3x)/[(x-4)(x+1)]

As usual, you cannot divide by zero, so any values of x that make a denominator zero are excluded.

Now show us what you got on the others you posted. As it says, show your work.

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