Question

If x+y=9 and xy=16,find the value of(x2+y2)

Answer 1

Given condition is x+y=9 and xy=16

then x2+x2

x+y=9

S. O. B. S

x2+y2+2xy=81

x2+y2+2(16)=81

x2+y2+32=81

x2+y2=81-32

x2+y2=49

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