Question

Can anyone tell me : la1" title=" {a}^{2} + {b}^{2} " alt=" {a}^{2} + {b}^{2} " align="absmiddle" class="latex-formula">
​

Answer 1

$\large \boxed{ {a}^{2} + {b}^{2} = {(a + b)}^{2} - 2ab}$

The formula is derived from the (a+b)² which can be expanded as:

$\large \boxed{ {(a + b)}^{2} = {a}^{2} + 2ab + {b}^{2} }$

Now since we only want a²+b² and not 2ab. We can add -2ab after (a+b)² which result in (a+b)²-2ab. This formula is pretty useful it comes to higher maths.

Answer

• a²+b² = (a+b)²-2ab

If this is not what you are looking for then let me know through comment!