Question

(Q21):
If a+3b=6 and ab=3, then the value of a² +9b² is:
a. 2
b: 12
c. 18
​

Answer 1

HEY MATE HERE IS YOUR ANSWER--

ANSWER :-

(C) =18

Ab = 3

a = 3/b

a+3b = 6

3/b+3b = 6

3+3b² = 6b

3b²-6b+3 = 0

b²-2b+1 = 0

(b-1)² = 0

b-1 = 0

b = 1

a = 3/b

a = 3/1

a = 3

a²+9b²

= (3)²+9(1)²

= 9+9

= 18