Please explain #13, test 1, Section 3.
Yeah, this is a great question, right? 🙂
You’re given this:
You’re going to have to deal with it in two parts. First, get the bottom simplified. Step 1 is to multiply by some clever forms of 1 to get a common denominator:
Now multiply those fractions on the bottom. Your common denominator will be .
Now that you’ve got a common denominator, add to get one big fraction on the bottom.
From there, all you need to remember is that when you divide by a fraction, you flip the divisor and multiply. In other words:
So there you have it—the answer is B.