# Discontinuity Graphs Homework Check

• Sep 26th 2012, 11:55 AM
Kathrynm77
Discontinuity Graphs Homework Check
I think most of my answers are right but need confirmation

The directions are to ....

a) Make a sketch of the graph
b) Represent any points of discontinuity with a hole
c) Name domain and range
d) Where appropriate, simplify and name new function

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1. h(x) = sqrt(3x-4)
a) upper half of sideways parabola infirst quad starting at x=4/3
but i dont know what the y-value is
b) no holes?
c) D=[4/3,inf)
R= ?
d) cant be simplified
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2. F(x)= (4x2-1)/(2x+1)
a)line with positive slope with y int at -1
b) hole at (-1/2,-2)
c) D=(-inf,-1/2),(-1/2,inf)
R=(-inf, -2), (-2,inf)
d) new function = 2x-1
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3. f(x)=(x2-4x+3)/(x-1)
a) line with positive slope with y-int at -3
b) hole at (1,-2)
c) D=(-inf, 1),(1,inf)
R=(-inf,-2),(-2,inf)
d) new function = x-3
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4. This ones a piecewise function
f(x)={2x-1 if x cant equal 2
{0 if x=2
a)line with y int at -1 and point at (2,0)
b) hole at (2,3)
c) D=all reals
R=(-inf,3), (3,inf)
d)cant be simplified
__________________________________________________ _____________
5. also a piecewise function
h(x)={x+6 if x is less than or equal to -4
{sqrt(16-x2) if -4<x<4
{6-x if x is greater than or equal to 4
a) semi circle in top half of graph with ends at 4 and -4 but open circles, one line with negative slope in second quad above x-axis at -4 and the same image flipped in other quad
b) holes at (-4,0) and (4,0)
c) D= all reals
R=(-inf, 4)
d) cant be simplified
__________________________________________________ _____________________________________
6. also piecewise function
g(x)={x-2 if x<0
{0 if x=0
{x2+1 if x>0
a)right side of parabola with open circle on y int, point at the origin, line with negative slope y-int at -2 as open circle
b)holes at (0,1) and (-2,0)
c) D=all reals
R=(-inf,-2),[2,2],(1,inf)
d) cant be simplified
__________________________________________________ __________________________________________________ ___
7. F(x)= (x3+3x2+x+3)/(x+3)
a) parabola centered at origgin with hole at x-value of -3
b) hole at (-3,10)
c) D=(-inf, inf),(x cant equal -3)
R= [0,inf), (y cant equal...10?)
d) new function = x2+1
__________________________________________________ _________________________________________-
Thanks
• Sep 26th 2012, 01:28 PM
Kathrynm77
Re: Discontinuity Graphs Homework Check
This is due tomorrow and I really want to make sure my answers are correct so any help at all would be greatly appreciated