factorise (a+2b)square - a square
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(a+2b)^2 - a^2
=> (a+2b-a)(a+2b+a)
=> (2b) (2a+2b)
=> 2b *2 (a+b)
=> (4b)(a+b)
=> (a+2b-a)(a+2b+a)
=> (2b) (2a+2b)
=> 2b *2 (a+b)
=> (4b)(a+b)
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(a + 2b)square 2- a square
a^2 + 4b^2 - a^2
By using property
a^2-2ab+b^2
a^2 + 4b^2 - a^2
By using property
a^2-2ab+b^2
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