Question

3. Add:
(i) 3mn - 4m +n, 2m - 5mn, 2n + mn - m
(ii) 4x y2 – 3y2, 2y2 – 3xy, 5xy - y2 + 7xy
(iii) 2pq - 3qr + rp, 3gr - rp, 4pq - qr.
4. Subtract:
(i) 2xy - y2 from yz - 2xy
​

Answer 1

Answer:

3. Ad

$(3mn - 4m + n ) + ( 2m - 5mn ) + (2n + mn - m)$

3mn - 4m + n

-5mn + 2m

+ mn - m +2n

__________________

-mn - 3m + 3n

ii)

4xy² - 3y², 2y²-3xy, 5xy - y² + 7xy

=>

4xy² - 3y² + 2y² - 3xy + 5xy - y² + 7xy

4xy² + 2y² - 3y² - y² + 5xy - 3xy + 7xy

4xy² - 2y² + 9xy

iii)

2pq - 3qr + rp, 3gr - rp, 4pq - qr

=>

2pq - 3qr + rp + 3gr - rp + 4pq - qr

2pq + 4pq - 3qr - qr + rp - rp + 3gr

6pq - 4qr + 3gr

4. subtract

i)

2xy - y² from yz - 2xy

yz - 2xy - ( 2xy - y² )

yz - 2xy - 2xy + y²

yz - 4xy + y²