Question

3. Simplify the following combining like terms:
(i) 21b - 32 + 7b - 206
(ii) 12m2 - 9m + 5m - 4m2 - 7m + 10
(iii) -z2 + 13z2 - 5z + 7z3 - 15z
(iv) 5xļy - 5x2 + 3yx2 – 3y2 + x2 - y2 + 8xy2 – 3y2
(v) p - (p - 9) - (9 - p) - 9
(vi) 3a - 2b - ab - (a - b + ab) + 3ab + b - a
(vii) (3y2 + 5y - 4) - (8y - y2 - 4)​

Answer 1

Answer:(i) 21b-32+7b-206

21b+7b-32-206

28b-238

ii) 12m2 - 9m + 5m - 4m2 - 7m + 10

12m2-4m2-9m+5m-7m+10

16m2-11m+10

iii) -z2 + 13z2 - 5z + 7z3 - 15z

-z2 + 13z2- 5z- 15z+ 7z3

12z2-20z+7z3

iv) 5xļy - 5x2 + 3yx2 – 3y2 + x2 - y2 + 8xy2 – 3y2

5xļy- 5x2+ x2+ 3yx2 + 8xy2– 3y2- y2– 3y2

5xļy-4x2+11yx2-7y2

v) p - (p - 9) - (9 - p) - 9

p-p+9-9+p-9

2p-p-18+9

p-9

vi)3a - 2b - ab - (a - b + ab) + 3ab +b - a

3a - 2b - ab-a+b-ab+ 3ab +b - a

3a-a- a- 2b+b+b- ab-ab+ 3ab

3a-2a-2b+2b-2ab+3ab

a+ab