Hi my name is Claire Gallaher on the author of Master whacky way which is the GCSE maths textbook to help students with their GCSE maths now I'm here today to run through indices to make them a bit more wacky and indices where we have some unknowns so you might see an X you might see a Y it's all about bringing them together and simplifying them let's take for example Y to the power of 4 times y to the power of 5 now because they're both Y's what we're able to do is actually simplify it together now if they were different if we had a Y and X we wouldn't be able to simplify them because they're two y's we can use a rule which will just bring them together nicely what we're going to do is we're going to look at the multiplication sign and this needs to be up in the air because the numbers four and five are up in the air now the multiplication sign is down here we need to take it up and because it leaves the ground it's windy and it twists and becomes a positive so the x is going to leave the ground go up to join the numbers and will become an addition sign that will therefore mean that we add the 4 and the 5 together which gives us Y to the power of 9 it's as simple as that let's take another one so if we have a look at Y to the power of 7 times y what you might think with this one is well let's take the multiplication sign up into the air it will twist and become a plus let's add them together well there's a 7 but there's nothing...

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