simplify

Question

2(a^2+2b+2a^2)+b+2c
answer: 4a^2+5b+2c
also
6a^2-a^2+16=7a^2+16 correct??

Answer 1

a^2 + 2b + 2a^2 = 3a^2 + 2b

2 * ( a^2 + 2b + 2a^2 ) + b + 2c =

2 * ( 3a^2 + 2b ) + b + 2c =

6a^2 + 4b + b + 2c =

6a^2 + 5b + 2c

Answer 2

6a^2 - a^2 + 16 = 5a^2 + 16

Answer 3

8^2 divid 16x2-5