I still need help with the following problems...

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I still need help with the following problems...

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If you can't open them, I'll type them out for you. My HW website won't let me copy and paste.
I can't open the file...

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evidently the line through (7,7) meets y = x at (7,7) !!
#15) Find the intersection of the line through points (7,7) and (4,2) with the line y=x. The point of intersection is (A,B) where A=___ B=___
\[x^2-3\] intersect the x axis at \[\sqrt{3}\] and \[-\sqrt{3}\] and the distance between these to points is \[2\sqrt{3}\]
#15 not to be snarky, but it is asking who is buried in grant's tomb. if it goes through (7,7) that is where y = x
for #20 you have to decide which rule to use. since \[-1\leq 2\] you know \[f(-1)=2\times -1=-2\]
since \[x>2\] =you use \[f(3)=6\times 3^2+3+4\]
and since \[2 \leq 2\] is true you use \[f(2)=2\times 2=4\]
yeah, i knew that i had to do that for 20 but i got the wrong answer for some reason... for 18, i dont know why the answer is not 3 or 4.
because you are asked for the distance between \[(-\sqrt{3},0)\] and \[(\sqrt{3},0)\] and that is \[2\sqrt{3}\]
o sorry, didnt see u solved #18 too cause u didnt put the # in front of it.
so how did u get those numbers for #18? im a little confused on that
and for #20 i got -2, 61, and 30 but those are wrong... why?
Do you know how to find the points where the parabola crosses the x axis?
no...
If a point is on the x axis, the y value is 0 so set y = to 0 and solve
so i would get plus minus radical 3
Yes. So the parabola crosses the x axis at (sqrt3,0) and (-sqrt3,0)
But the question doesn't ask for the two points. It asks for the distance between the points. Do you know how to find the distance between two points?
distance formula
yep
what was that again?
cant keep track of all the formulas
\[d=\sqrt{(x _{2}-x _{1})^{2}+(y _{2}-y _{1})^{2}}\]
Thanks a lot!
|dw:1327017935457:dw|
Did you get it
im getting a decimal when i subtract - radical 3 and radical 3
im using my calc btw
ok nvm

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