state gov UPPSC Staff Nurse Mock Test 2023 Quantitative Aptitude Algebra Identities

If  (x + y) = 2a  and  xy = 2b , then x2 + y2   in terms of ‘a’ and ‘b’ is

1
2a2 - b
2
a2 - 2b
3
4(a2 - b)
4
4(a2 - 2b)
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