If x+y=-1 and xy =-12, find the value of
(a) (x+1)(y+1) ,
(b) x² + y² ,
(c) (x-y)² .
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Hi
A) (x+1)(y+1)
= xy+x+y+1
= -12-1+1
= -13+1
= -12
B) x^2+y^2
=(x+y) (x-y)
=-1x +1y
C) (x-y)^2
= -1^2
= 1
solved
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