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I was doing some maths revision and the clip I was watching told me the following:

(2y+1)^2 = 4y^2+4y

I understand how the 4y^2 part was achieved but I don't get how or where the +4y bit comes from.
Can someone please help me.

-Thanks
 Jun 12, 2012

2+0 Answers

 #1
avatar+3146 
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(2y+1)^2
(2y+1)*(2y+1)
2y*2y+1*2y+1*2y+1*1
4y^2+2y+2y+1
4y^2+4y+1
 Jun 12, 2012
 #2
avatar+8 
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Ah thank you!
I keep forgetting when something in brackets is squared it's essentially two of the same brackets multiplied by each other.
 Jun 12, 2012

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