Question

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

Answer 1

Answer:

41

Step-by-step explanation:

By putting the values a + b = 9 and ab = 20, in the identity (a + b)² = a² + b² + 2ab

We have 9² = a² + b² + 2 * 20= 81

= a² + b² + 40 a² + b²

= 81 – 40

= 41

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