Question

help me people please

Answer 1

xy=8
x²+y²=20

y=8/x
x²+(8/x)²=20

y=8/x
x²+64/x²=20

y=8/x
x⁴+64=20x²

x⁴-20x²+64=0
D=20²-4*64=400-256=144=12²
x²₁=(20-12)/2=4     x₁₂=+-2  y₁₂=+-4
x₂²=(20+12)/2=16  x₃₄=+-4  y₃₄=+-2

Answer 2

спс