Question

1) if x-y = 8 and xy= 5, find x²+y²
2) if x-y= 10 and xy= 21, find 2(x²+y²)
3) if a²+b² = 13 and ab = 6, find
i) a+b ii) a-b

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Answer 1

Step-by-step explanation:

if x-y = 8 and xy= 5, find x²+y²

2) if x-y= 10 and xy= 21, find 2(x²+y²)

3) if a²+b² = 13 and ab = 6, find

i) a+b ii) a-b