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Though, the previous one is also the question I don't know. Just do it later.
if x was zero then b would be........
I told you I know b<0. I don't know range of value for a only
a has to be postive
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
OMG, I've never though in that way. Thank you!
but b could be so large like -1000000 that it would never go above the line