Fi mm d x2+y2 if (x+y) = -14 and xy=84
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we know that,
(x+y)² = x²+y²+2xy
(-14)² = x²+y²+2(84)
196 = x²+y²+168
=> x²+y² = 196-168 = 28
(x+y)² = x²+y²+2xy
(-14)² = x²+y²+2(84)
196 = x²+y²+168
=> x²+y² = 196-168 = 28
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