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Video instructions and help with filling out and completing When Form 8815 Index

Instructions and Help about When Form 8815 Index

Now we're going to talk about powers and indices. You might have heard of them before; they are the little numbers that you sometimes see next to normal numbers. For example, if we have a normal sized 5 and I put a little 2 on it, you might know that it means 5 squared. This means that we are going to take 5 and multiply it by itself 5 times (5 x 5 = 25), so 5 squared is 25. Now let's say we had 5 with a 3 on it. That means 5 cubed, which is 5 times 5 times 5. If we work that out (5 x 5 = 25), then multiply that answer by 5 (25 x 5 = 125), we get 125. The little number on top, the 3 here, is called the index. If there's only one, you call it the index, but if there is more than one, they are called indices. When a number is written with an index, it is said to be in index form. Let's have a look at another example: 2 to the power of 4. Unlike 2 squared or 2 cubed, 2 to the power of 4 doesn't have a special name. We simply say 2 to the power of 4, which means 2 multiplied by itself 4 times (2 x 2 x 2 x 2 = 16). Now, let's say someone gave us a sum: five times five times five times five. If we had to write that in index form, it would be 5 to the power of 4 (because there are four of them). So, if there's an index, it means it's in index form. You can also use indices with letters. For example, if we have an x multiplied by another x multiplied by another x, in index...