Question 126704
Find the inverse of y=sqrt(x+9)
Note: this function is defined for x>=-9
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Inverse:
x = sqrt(y+9)
x^2 = y+9
y = x^2-9
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Note: y= x^2-9 is a function. As an inverse to 
y=sqrt(x+9) it is a function defined for x>=0
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Cheers,
Stan H.