Question

seja f: y= x²+2 , determine a , sabendo que f-¹(a)= 3

Answer 1

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y = x² + 2

x² = y - 2
x = ± √(y - 2)

f^-1(x) = ± √(x - 2)

f^-1(a) = 3 

√(a - 2) = 3

a - 2 = 9
a = 11