Question

Expand (3x-y) square. Answer me quickly​

Answer 1

Answer:

${(3x - y)}^{2} \\ = {(3x)}^{2} + {(y)}^{2} - 2.3x.y \\ = 9 {x}^{2} + {y}^{2} - 6xy$

Hope it helps

Answer 2

Answer:

${(3x - y)}^{2}$

$using \: {(a - b)}^{2} = {a}^{2} + {b}^{2} - 2ab$

${(3x)}^{2} + {(y)}^{2} - 2(3x)(y)$

$9 {x}^{2} + {y}^{2} - 6xy$