Question

a square + b square = 3 ,ab = 6, find a-b

Answer 1

(a-b)²=a²+b²-2ab,

(a-b)²=3-2×6,

(a-b)²=3-12,

(a-b)²=-9,

then

(a-b)=√(-9),

(a-b)=3i