Simplify (3a4 – 2a2 + 5a – 10) – (2a4 + 4a2 + 5a – 2).

3a⁴-2a²+5a-10-2a⁴-4a²-5a-2
=3a⁴-2a⁴-2a²-4a²+5a-5a-10+2
=a⁴-6a²-8

Ithink the answer is last one.

The question is kind of confusing. if it's asking how many variations of answers can you give. then do 4^5 for your answer.this would be something like the first question could be a and the 2nd c or first b next c etc. if you can, ask the teacher for a better confirmation of what it's asking. if i'm assuming correctly what it's asking, it's 625 different variations.