Question

help me pls !!!!!!!!!!!!!!!!!!​

Answer 1

Step-by-step explanation:

1- 3mn-5mn+8mn-4mn

-2mn+4mn

2mn

2- 4x2y-3xy2-5xy2+5x2y

4x2y+5x2y-3xy2-5xy2

9x2y-8x2y

3- ab-4a+4b-ab+4a-4b

0

4- 14x+10y-12xy-13+18-7x-10y+8xy+4xy

7x+5

Answer 2

Answer:

(i) 3mn + (-5mn) + 8mn + (-4mn)

3mn - 5mn + 8mn - 4mn

-2mn + 4mn

= 2mn

(ii) 4x2y + (-3xy2) + (-5xy2) + 5x2y

4x2y - 3xy2 - 5xy2 + 5x2y

4x2y + 5x2y  - 3xy2 - 5xy2 (like terms)

9x2y - 8xy2

(iii) ab - 4a + 4b +(-ab) + 4a + (-4b)

ab - 4a + 4b - ab + 4a - 4b

ab - ab - 4a + 4a + 4b - 4b (like terms)

ab - ab = 0

-4a + 4a = 0

4b - 4b = 0

So, the answer is 0

(iv) 14x + 10y  + (-12xy) + (-13) + 18 + (-7x) + (-10y) + 8xy + 4xy

14x + 10y -12xy -13 + 18 -7x -10y + 8xy + 4xy

14x-7x + 10y - 10y -12xy + 8xy + 4xy - 13 + 19 (like terms)

7x + 0 + 0 + 6

so the answer is 7x + 6

Step-by-step explanation: