Question

Need help with this, i dont understand so please also explain!

Answer 1

The rule for dividing exponents is:
For exponents with the same base, you can subtract the exponents and put the difference as exponent over the base. Remember that the fraction bar acts as a division sign! Or: $\frac{ a^{m} }{a^{n} } = a^{m} \div a^{n} = a^{m-n}$

For example: $\frac{ a^{5} }{a^{2} } = a^{5} \div a^{2} = a^{5-2} = a^{3}$

Back to your problem:
You're asked to simplify $\frac{a^{12} b^{8} }{a^{2} b^{4}}$.

Use your exponent rule for dividing exponents. 
$\frac{a^{12} b^{8} }{a^{2} b^{4}}\\ = a^{(12-2)} b^{(8-4)}\\ = a^{10} b^{4}$
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Answer: $a^{10} b^{4}$