msteph012311
trying to find x and y intercepts for ...
y=x^2+2.2x+1.21
and
y-x^2=7x
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hartnn
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hint :To get x-intercept put y=0 in the equation
to get y-intercept put x=0 in the equation
msteph012311
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thanks i know that part lol i just dont know how to go from there...like for the first one i did y=0 then i just used the quadratic formula is that right? i got -1 and -1.2?
hartnn
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x^2+2.2x+1.21 = 0
this can be factored,
and -1 ,-1.2 is incorrect
msteph012311
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so i cant use the quadratic formula?
hartnn
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those are correct, just be accurate
-1,-1.21
(instead of just -1.2)
hartnn
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and u can use formula also
msteph012311
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what about the second one i dont know where to start?
hartnn
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did u get y-intercept for 1st ?
msteph012311
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yes i got 1.21
hartnn
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now for 2nd eq.,
put x=0 for y-int.,
y-x^2=7x
y=0
so y-intercept = (0,0)
put y=0 for x-int
y-x^2=7x
0=x^2+7x
i believe u can solve this
hartnn
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sorry for late reply, i got disconnected
msteph012311
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x=0 and x=7?
right because i moved the -x^2 to the right
hartnn
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0 and -7 ?
msteph012311
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its ok....and oh yea -7
hartnn
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any more doubts ? all clear ?
msteph012311
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nope thank you so much :)
msteph012311
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can you help me with a few more though?
hartnn
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i am already helping 2-3 ppl at same time, i'll try though...