if x+y= 4 and xy=3 then find x-y
rita81:
x+y=4,xy=3,now, x^2+y^2-2xy=4^2-2x3=16-6=10therefore x-y=√10
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So, the issue here is that there can be two answers. One of them is 3, and the other is 1 (Because 3+1 = 4 and 3 x 1 = 3). The main issue is which one is which. However, if either of these are options for you, this should help- The answer is either 2 or -2.
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