Question

2
If a + b = 6 and ab = 3, then a + b is
A) 241
B) 125
02​

Answer 1

we have,,

a+b = 6

squaring on both sides

a²+b²+2ab = 36

a²+ b² = 36-2(3)

= 36-6

= 30 ....ans.

Answer 2

Answer:

Formula

(a+b) 2

a 2

b 2

2ab

a+

b=

5

ab=

6

= >

a 2

b 2

(a+b) 2

2ab

So,

a 2

b 2

(a+b) 2

2ab=

5 2

2×

6=

25−

12=

13