א) ( x + 3 ) 2 = x 2 + 6 x + 9 {\displaystyle \left(x+3\right)^{2}=x^{2}+6x+9} ב) ( a − 6 ) 2 = a 2 − 12 a + 36 {\displaystyle \left(a-6\right)^{2}={a}^{2}-12a+36}
