Question

If x+y= -4 xy. 2
thes the value of
x2 + y2​

Answer 1

$(x + y) {}^{2} = x {}^{2} + y {}^{2} + 2xy \\ 16 = x {}^{2} + y {}^{2} + 4 \\ x {}^{2} + y {}^{2} = 12$