I know, you might say I'm stupid because I don't know this, but I'm stuck.
I need to know how to do this :
(x + y)²
Would it be something like :
x² + (2 x xy) + y²
x² + xy² + y²
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The thing is though, I know how to do this :
(5 + x)²
= 25 + (2 x 5x) + x²
= 25 + 10x + x²
Seeeee ^^
I know how to do the ones with a letter and number, but I don't know how to do the ones with two letters.