19.补充一道： Q. In which quadrants do the roots of the equation lie, given x and y are integers: Y = (x-2)^2 -1 Y = (x-2)^2 -1 Y=x^2+4-4x-1 Y=x^2-4x+3 Y=(x-1)(x-3) so, either x=y+1 or x=y+3 we can't determine what quadrant exactly x and y lie, so the answer would be E
What is the question asking? asking what quadrant will this graph pass? because the roots of the equation will be two points on X axis, and the roots will not pass any quadrant.
以下是引用plbl1510在2006-10-14 6:09:00的发言： What is the question asking? asking what quadrant will this graph pass? because the roots of the equation will be two points on X axis, and the roots will not pass any quadrant.
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发表于 2006-10-14 02:50:00
