RolyPoly
Can anyone help me?
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dcolley
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with what?
RolyPoly
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That one
dcolley
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we just started learning this
RolyPoly
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I'm having troubles with it. I know b<0, but not a
RolyPoly
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Oh ,, I posted the wrong question
RolyPoly
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There you are~
RolyPoly
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Though, the previous one is also the question I don't know. Just do it later.
benice
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if x was zero then b would be........
RolyPoly
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I told you I know b<0. I don't know range of value for a only
benice
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a has to be postive
RolyPoly
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why?
benice
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we know b is negative ...
x is postive /...... x^2 is postive ......-x^2 is negative...
so we have two negative terms but still ax is reaching above the x axis...
we x is postive ..... so a must be postive to make ax postive
plus ax has to be greater than -x^2+b
RolyPoly
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OMG, I've never though in that way. Thank you!
benice
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cool
but b could be so large like -1000000 that it would never go above the line