Question

If a + b = 9 and ab = 20, find the value of (a² + b²). *​

Answer 1

Answer:

41

Step-by-step explanation:

given , a + b = 9

               ab = 20

so, a = 5, b = 4

(a² + b²) = (5² + 4²)

             = ( 25 + 16)

              = 41

NOTE

(a² - b²) = (a + b) (a - b)

(a² + b²) ≠ (a + b) (a + b)