If a = 3, B = 1 / 3, what is the square of (a + b) - (a + b) (a-b) + 2B?

If a = 3, B = 1 / 3, what is the square of (a + b) - (a + b) (a-b) + 2B?

(a+b)²-(a+b)(a-b)+2b²
=a²+2ab+b²-a²+b²+2b²
=2ab+4b²
=2*3*(1/3)+4(1/3)²
=2+4/9
=22/9