Question

15. If ab = 6 and a + b = 5 then the value of (a² +b²) is​

Answer 1

Answer:

a² +b²=13

Step-by-step explanation:

a+b = 5

ab = 6

(a+b)² = a² +b² +2 ab

(5)² = a² + b² +2(6)

25 = a² + b² +12

25-12 =a²+b²

13 = a² + b²

Answer 2

$\mathbb\red{Answer}$

a² + b² = 13

$\mathbb\blue{Solution}$

(a+b)²= a² + b²+ 2ab

(a+b)²= a² + b²+ 2ab(5)² = a² + b² + 2(6)

(a+b)²= a² + b²+ 2ab(5)² = a² + b² + 2(6)25 = a²+ b² + 12

(a+b)²= a² + b²+ 2ab(5)² = a² + b² + 2(6)25 = a²+ b² + 12a² + b² = 25 - 12

(a+b)²= a² + b²+ 2ab(5)² = a² + b² + 2(6)25 = a²+ b² + 12a² + b² = 25 - 12a² + b² = 13