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You can combine like variables but not unlike variables.

So, for example, x2 * x2 = x4 but x2 * y2 does not equal xy4!

Let's make x equal 2 and y equal 3 just to demonstrate this.

So if x2 * x2 = x4 then 22 * 22 = 24 which would mean 4 * 4 = 16 (Yes, that's right)

But x2 * y2 can not be combined. 22 * 32 = 4 * 9 = 36 (which is not equal to a combination of x and y to the power 4).

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13y ago

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