Question

if ab= 1 and (a+b) = -1 ,then a² + b²=​

Answer 1

Explanation:

given: ab = 1 and (a+b) = -1

solution: (a+b) square = a square + b square + 2ab

substituting the values, we get

(-1) square = a square + b square + 2×1

that is, 1 = a square + b square + 2

that is, a square + b square = 1-2 = -1