Question

Could anyone explain to me about adding and subtracting exponents. I don’t understand these equations with their exponents!

Answer 1

whenever you're multiplying terms that have exponents you multiply the coefficients and add their exponents:

Explanation:

I think the answer to your first question should be:

30a²b - 30ab²

Your second answer is good

whenever you're multiplying terms that have exponents you multiply the coefficients and add their exponents:

for example, 6a²b³c x 2abc = 6(2)(a²)(a)(b³)(b)(c)(c)

= 12a³b⁴c²