Question

Subtract the sum of 3x + 2y – 9z - 7, - 5x + 4y – 6z – 4 and

4x – y + 8z - 2 from the sum of 7x – 2y + 3z - 5 and 5x - 7y – z + 3​

Answer 1

$\huge\orange{Answer}$

3x + 2y – 9z - 7

- 5x + 4y – 6z – 4

4x – y + 8z - 2

7x – 2y + 3z - 5

5x - 7y – z + 3 ★━━━━━━━━━━━━━━━━━━━━★

2x - 5y - 7z - 13

-12x - 9y + 2z + 2

So, -10x + 4y - 9z - 15 is your ans..

Answer 2

Answer:

(ii) 2x2y + (- 4x2y) + 6x2y + (- 5x2y)

= 2x2y - 4x2y + 6x2y - 5x2y

= (2 - 4 + 6 - 5)x2y

= (8 - 9)x2y

= -x2y