SOLUTION: Write the equation given information: Hole when x=-2 Horizontal asymptote y=0 Vertical asymptote x=0, x=-5 x-intercept (3,0)

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Question 1179017: Write the equation given information:
Hole when x=-2
Horizontal asymptote y=0
Vertical asymptote x=0, x=-5
x-intercept (3,0)

Answer by MathLover1(20850) About Me  (Show Source):
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Write the equation given information:
Hole when x=-2
Horizontal asymptote y=0
Vertical asymptote x=0, x=-5
x-intercept (3,0)
A rational function is one such that f%28x%29=P%28x%29%2FQ%28x%29, where Q%28x%290; the domain of a rational function can be calculated.

given: hole when x=-2
The hole means that the numerator and denominator are both zero at x=-2
-> numerator P(x) must have x-%28-2%29=x%2B2 as a factor
P%28x%29%2FQ%28x%29+=%28x%2B2%29+%2F%28x%2B2%29
given horizontal asymptote y=0
If the degree of the numerator is less than the degree of the denominator, then the horizontal asymptote is always the x axis, i.e. the line y+=+0
=>so, P%28x%29+=%28x%2B2%29+

Vertical asymptotes occur at singularities of a rational function, or points at which the function is not defined. They only occur at singularities where the associated linear factor in the denominator remains after cancellation.
since given vertical asymptote x=0, x=-5, you have denominator
Q%28x%29=%28x-0%29%28x-%28-5%29%29=x%28x%2B5%29=x%5E2%2B5x
given x-intercept (3,0), so numerator have %28x-3%29
so , your function is:
f%28x%29=%28%28x%2B2%29%28x-3%29%29+%2F%28%28x%2B2%29%28x%5E2%2B5x%29%29

f%28x%29=%28x%5E2+-+x+-+6%29+%2F%28x%5E3+%2B+7x%5E2+%2B+10x%29