Question

If a + b = 5 and ab = 6, then a²+b²​

Answer 1

a² + b² = (a+b)(a-b)

putting the values-

(3)²+(2)²= (3+2)(3-2)

=5x1

=5

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Answer 2

Answer:

(a+b)²=a²+b²+2ab

(a+b)²-2ab = a²+b²

(5)²-2(6) = a² + b²

25 - 12 = a²+ b²

13 = a² + b²