(a+b)=a^2+2ab+b^2
what is this
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It's a formulae ......
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It's a formula
It is actually (a+b) ²
Take a square. Divide the square vertically into two parts by drawing a straight line. The lengths of them are $a$ and $b$ respectively.
Divide the square horizontally into two parts by drawing a straight line but the lengths of them should also be $a$ and $b$ respectively.
The length of whole square is $a+b$ and width of this square is also $a+b$. Therefore, the area of the square is $(a+b) × (a+b) \,=\, {(a+b)}^2 geometrically.
It is actually (a+b) ²
Take a square. Divide the square vertically into two parts by drawing a straight line. The lengths of them are $a$ and $b$ respectively.
Divide the square horizontally into two parts by drawing a straight line but the lengths of them should also be $a$ and $b$ respectively.
The length of whole square is $a+b$ and width of this square is also $a+b$. Therefore, the area of the square is $(a+b) × (a+b) \,=\, {(a+b)}^2 geometrically.
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