racace à¸à¸à¸¥à¸à¸à¹à¸à¹à¹à¹à¹ f ( x ) = ( a + b ) 2 = a 2 + 2 a b + b 2 {\displaystyle {\begin{aligned}f(x)&=(a+b)^{2}\\&=a^{2}+2ab+b^{2}\\\end{aligned}}}
