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Which statement is true about the discontinuities of the function f(x) = x-5/3x^2-17x-28 A)There are...
4 months ago
Q:
Which statement is true about the discontinuities of the function f(x) = x-5/3x^2-17x-28 A)There are holes at x = 7 and .B)There are asymptotes at x = 7 and .C)There are asymptotes at x = –7 and .D)There are holes at (–7, 0) and .
Accepted Solution
A:
1) function f(x)
x - 5
f(x) = ----------------
3x^2 - 17x - 28
2) factor the denominator:
3x^2 - 17x - 28 = (3x + 4)(x - 7)
x - 5
=> f(x) = -----------------------
(3x + 4) (x - 7)
3) Find the limits when x → - 4/3 and when x → 7
Lim of f(x) when x → - 4/3 = +/- ∞
=> vertical assymptote x = - 4/3
Lim of f(x) when x → 7 = +/- ∞
=> vertical assymptote x = 7
Answer: there are assympotes at x = 7 and x = - 4/3