Question

Is my answer correct?

Answer 1

hold on lemme type this

Answer 2

\[(39a ^{4}-4a ^{3}+2a ^{2}-a-7)-(10a ^{4}+3a ^{3}-2a ^{2}-a+8)\]

Answer 3

my answer is: \[29a ^{4}-a ^{3}+1\]

Answer 4

should be \[\large 29a^4-7a^3+4a^2-15\]

Answer 5

my answer is: \[29a ^{4}-a ^{3}+1\]

Answer 6

OH. wow. i see my error.

Answer 7

-4a^3-(3a^3) = -7a^3

Answer 8

2a^2-(-2a^2) = 2a^2+2a^2=4a^2

Answer 9

-7-(8) = -15