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Mathematics 24 Online
zarkam21:

Help please

zarkam21:

1 attachment
zarkam21:

i already got the asymptotes

Vocaloid:

if you'd like me to check the asymptotes I'd be ok with that

zarkam21:

Okay so I have 26. vertical x=0 no horizontal 27. vertical x=-4 horizontal y=0 28. vertical x=-2.748 horizontal y=2 29 vertical x=-3 horizontal y=1

Vocaloid:

I can't see the problem for 29

zarkam21:

1 attachment
Vocaloid:

asymptotes look good for x-intercepts simply take the factors from the numerators and set them equal to zero and find the xvalues

Vocaloid:

so start by factoring x^2- 12x + 20

zarkam21:

26. x intercept (10,0)(2,0) y intercept none 27. x intercept (8,0)(-1,0) y intercept (0,-1/8) 28. x intercept (1,0)(-1-sqrt3/2 , 0) (-1+sqrt3/2 , 0) y intercept (0,1/7) 29. x intercept (1,0) y intercept (0,-1/3)

zarkam21:

sorry it took me a while

Vocaloid:

good, well done

Vocaloid:

for removable discontinuities you will have to factor the numerator and the denominator and see which produce roots that can be cancelled in the numerator/denominator

zarkam21:

okay so

Vocaloid:

afaik 26 and 27 don't have any removable discontinuities so start with 28

zarkam21:

okay so do i factor the num. and denom. separately

Vocaloid:

yes

Vocaloid:

then re-write the function in factored form and see if anything cancels out

zarkam21:

okay so for example 28 it would be (x-1)(2x^2-2x-1)

zarkam21:

I factored the numerator

Vocaloid:

yeah, I don't think 28 has any removable discontinuities 29 does have one though

zarkam21:

um is it infinite discontinuity x=0?

Vocaloid:

when you factor the numerator and denominator of 29 what do you get?

zarkam21:

(x-1)(x+5) and (x+3)(x+5)

zarkam21:

so x+5 and cancels out

Vocaloid:

good, so x = - 5 is the removable discontinuity that's it

zarkam21:

thanks !

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