Question

Simplify combining like terms: (i) 21b – 32 + 7b – 20b (ii) – z2 + 13z2 – 5z + 7z3 – 15z

Answer 1

21b-32 plus 7b-20b          =21b plus 7b-20b-32    =8b-32 ans...

Answer 2

Hi,

(1) 21b - 32 + 7b - 20b

= 21b -20b +7b -32

= b + 7b - 32

= 8b - 32

(2) - z2 + 13z2 - 5z + 7z3 - 15z

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

= - 20z + 12z2 + 7z3

So this both are your simplified terms. If you've any other doubt or query feel free to ask. Thank you.