Question:
If x + y = a and x - y = b, then 2xy =
-
a.
(b2 - a2)/2
-
b.
(a2 - b2)/2
-
c.
(a - b)/2
-
d.
ab/2
-
e.
(a2 + b2)/2
Answer: b
 (b2 - a2)/2 b) (a2 - b2)/2 c) (a - b)/2 d) ab/2 e) (a2 + b2)/2 Ans. b) (a2 - b2)/2
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