Question

30–17(x-y)-21(x-y)²
do fast​

Answer 1

I THINK THIS IS THE ANSWER....

Answer 2

Answer:

$30 - 17(x - y) - 21 {(x - y)}^{2} \\ 30 - 17x + 17y - 21( {x}^{2} + {y}^{2} - 2xy) \\ 30 - 17x + 17y - 21 {x}^{2} - 21 {y}^{2} + 42xy \\ 30 - 17x - 21 {x}^{2} + 17y - 21 {y}^{2} + 42xy \\ 30 - x(17 + 21x) + y(17 - 21y) + 42xy$