Question

3. If a2 + b2 = 13 and ab = 6, find the value of (a + b).​

Answer 1

Answer:

a² + b² = 13------ (1)

ab = 6

=> 2ab = 12 ------(2)

On adding equations 1 and 2,

a² + b² + 2ab = 13 + 12

=> (a+b)² = 25

=> a+b = √25

=> a+b = +- 5

Hence, the value of (a+b) is +5 as well as -5