Question

if x-y=9,xy =2 find x³-y³

Answer 1

I hope it helps you

Answer 2

${x}^{3} - {y}^{3} = (x - y)( {x}^{2} + xy + {y}^{2} ) \\ 9 \times ( {x}^{2} + 2 + {y}^{2} ) \\ 9 {x}^{2} + 9 {y}^{2} + 18$