The multiplication rule is that when multiplying terms with indices, you add the indices up. In an example, if we had to simplify 3y² x 4y³ then we would first multiply the coefficients together (the numbers before the letters), 3x4 = 12. The next thing we do is multiply the y's, we have y² x y³, which means that our indices are going to come to 2+3 = 5. Therefore the answer is 12y⁵. Think of it this way: 2 x 2 is equal to 2². 2² x 2 is equal to 2 x 2 x 2, which is also equal to 2³. It is the exact same principle here, but we are using letters instead of numbers!

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