Question

If (3a + 3b + 1) (3a + 3b - 1) = 80, then a + b =

Answer 1

Answer:

a+b = 4$\sqrt{3}$

Step-by-step explanation:

3(a + b)^2 = 81

(a + b)^2 = 27

a + b = sq rt 27

a + b = $\sqrt{9}$· $\sqrt{3}$

a + b = 3$\sqrt{3}$