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

Mathematics

1 answer:

seropon [69]3 years ago

8 0

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 $\sqrt{3}$

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