Question

If a + b = 8, ab = 7 then a² + b² = ______.

पर्याय

• 64

• 78

• 50

• 49

Answer 1

If a + b = 8, ab = 7 then a² + b² = 50.

Explanation:

a² + b² = (a + b)² − 2ab

= 8² − 2(7)

= 64 − 14 

= 50