Question

solve Q2 and Q3 with their parts please.. no CDT answers are required. chapter Algebraic expressions.. please solve with explanations.​

Answer 1

Answer:

2. (i) 3x,-5x,7x.

3x+(-5x)+7x.

3x-5x+7x. (because +×-=-).

10x-5x.

5x.

(ii) 7xy,2xy,-8xy.

7xy+2xy+(-8xy).

7xy+2xy-8xy.

10xy-8xy.

2xy.

(iii) -2abc,3abc,abc.

-2abc+3abc+abc.

-2abc+4abc.

2abc. (because largest number is important).

(iv) 3mn,-5mn,8mn,-4mn.

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

3mn-5mn+8mn-4mn.

11mn-9mn. (because -×-=+).

2mn.

(v) 2x³,3x³,-4x³,-5x³.

2x³+3x³+(-4x³)+(-5x³).

2x³+3x³-4x³-5x³.

5x³-9x³.

-4x³.

3. (i) 21b-32+7b-20b.

21b+7b-20b-32.

28b-20b-32.

8b-32.

(ii) 12m²-9m+5m-4m²-7m+10.

12m²-4m²-9m+5m-7m+10.

8m²-16m+5m+10.

8m²-11m+10. (because -×+=-).

(iii) -z²+13z²-5z+7z³-15z.

7z³-z²+13z²-5z-15z.

7z³+12z²-20z.

(iv) 5x²y-5x²+3yx²-3y²+x²-y²+8xy²-3y².

5x²y+3yx²+8xy²-5x²+x²-3y²-y²-3y².

8x²y+8xy²-4x²+6y²-y².

8x²y+8xy²-4x²+5y².

(v) p-(p-q)-(q-p)-q.

p-p+q-q+p-q.

p-q.

I think this is your answer.