Mason3609 Mason3609

19-08-2016
Mathematics

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for the function f(x)=x^2-12 find (f^-1)(4)

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nobillionaireNobley nobillionaireNobley

19-08-2016

f(x) = x^2 - 12
y = x^2 - 12
y + 12 = x^2
x = sqrt(y + 12)
(f^-1)(x) = sqrt(x + 12)

(f^-1)(4) = sqrt(4 + 12) = sqrt(16) = 4
(f^-1)(4) = 4

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