Question

If a+b =9and ab=40then find value of a square +b square

Answer 1

(a+b)^2 = a^2 + b^2 + 2ab

putting values from the question

(9)^2 = a^2 + b^2 + 2(40)

81 - 80 = a^2 + b^2

1 = a^2 + b^2

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Answer 2

1 will be the answer.