Question

help please!!! metals! find any points discontinuity for the rational function. y=x-5/x^2-7x-8
A. x=-8
B.x=5
C. x=-1, x=8
D. x=1, x=-8

Answer 1

factorise \(x^2-7x-8\)

Answer 2

okay

Answer 3

so... D?

Answer 4

what did you get when you factored it?

Answer 5

(x-8)(x+1)

Answer 6

so \(x^2-7x-8 = 0 \implies (x-8)(x+1) = 0 \implies x = 8 \, \, or \, \, x = -1\)

Answer 7

oh ok, i got it. Thanks!