Question

Please help 17 points!!!

Answer 1

√10 * √8 =
√(10 * 8)  =
√80

Answer 2

Hello, the answer of suspho is correct but here is another procediment:

You prime factor 10 and 8... 10 = 2*5 and 8 = 2³

√2*5 * √2³

Let's take 2³ out of the square root. The radicand has a bigger exponent than the index (2) but you can't divide 2 by 3 so we write √2² * 2 and we can finally take out only 2²

√2*5 * 2√2 and multiply all the radicands.

2√20 and prime factor 20... 20 = 2²*5 and take 2² out

2√2² * 5 = 2*2√5 = 4√5

Answer B