Question

Help me 3×(x-y)-7(y-x)²

Answer 1

`{ \tt{3(x - y) - 7 {(y - x)}^(2) }} \\ \\\dashrightarrow \: { \tt{3(x - y) - 7(y - x)(y - x)}} \\ \\ \dashrightarrow \: { \tt{3x - 3y - 7 {y}^(2) + 14xy - 7 {x}^(2) }} \\ \\ \dashrightarrow \: { \tt{ - 7( {x}^(2) + {y}^(2)) + 14xy + 3x - 3y }} \\ \\ \dashrightarrow \: { \tt{ - 7 \{ {(x + y)}^(2) - 2xy \} + 14xy + 3x - 3y}} \\ \\ \dashrightarrow \: { \tt{7 {(x + y)}^(2) + 12xy + 3x - 3y }}`