Question

If x+y=-1 and xy =-12, find the value of
(a) (x+1)(y+1) ,
(b) x² + y² ,
(c) (x-y)² .

Answer 1

Answer:

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Answer 2

Step-by-step explanation:

According to Question,

Given - x + y = -1, xy = -12

(a) (x + 1)(y + 1) = xy + y + x + 1

= (-12) + (-1) + 1

= -12 - 1 + 1

= -12

(b) x² + y² = (x + y)²

= (-1)²

= 1

(c) (x - y)² = x² - 2xy + y²

= -2(-12) + (x + y)²

= 24 - 1

= 23

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