If x+y=9 and xy= -22, find (x-y)
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(x-y) ^2 = (x+y)^2 -4xy
= (9)^2 -4(-22)
= 81+88
169
(x-y) ^2 =169
x-y = root(169)
x-y=13 is answer
= (9)^2 -4(-22)
= 81+88
169
(x-y) ^2 =169
x-y = root(169)
x-y=13 is answer
Answered by
2
hope it help you. . . .
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