intercepts

orchidpsycho

New member
Joined
Sep 26, 2005
Messages
41
was asked to make a table of values and sketch graph for the equation. find x and y intercepts and test for symmetry

y=x^2-3

got the graph with points (0,3) (1,-2) (2,1) (-1,-2) (-2,1) (-3,6) (3,6)

its symmetrical with respect to the y axis because the equation is unchanged when x is replaced with -x

the problem I am wondering is when i find the intercepts I get

y intercept= -3 (0,-3)

but the x I get +- sqrt[3] is that right. wasnt sure how I would present that?

thanks for any help.
 

soroban

Elite Member
Joined
Jan 28, 2005
Messages
5,588
Hello, orchidpsycho!

Your work absolutely correct.
. . And you noted the symmetry . . . nice touch!

but the x I get +- sqrt[3] is that right. wasnt sure how I would present that?
It's not our fault that the intercepts are irrational numbers . . .
. . . . . . . . . . . . . . . _
We can write: . (±√3, 0)

If you're making a sketch, you can approximate it: .(±1.7, 0) is close enough.
 

orchidpsycho

New member
Joined
Sep 26, 2005
Messages
41
thanks.

Thought it was right but up until now I have'nt had any irrational numbers come into play.

Thanks for all the help. I don't know what I would do without people like you to help me along.


One more question. How did you get that square root symbol? Not sure how to do that?
 

fatsoh

New member
Joined
Oct 12, 2005
Messages
1
tutorial

Hi there,

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Thanks,



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fatou@easytutor.com
 

happy

Full Member
Joined
Oct 30, 2004
Messages
466
Nice advertising! :wink:
 

soroban

Elite Member
Joined
Jan 28, 2005
Messages
5,588
Hello, orchidpsycho!

How did you get that square root symbol?
There are codes available; I have a partial list.

You precede them with &# (ampersand, 'number') and follow them with ; (semicolon)

√ 8730

θ 952

≠ 8800

± 177

° 176 (degree)

→ 8594
 
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