The Answer to the Question
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1) f(x) = 3x + 10
INVERSE is x=(y-10)/3
2) f(x) = x2 - 1
To find the inverse function, swap x and y, and solve the resulting equation for x.
If the initial function is not one-to-one, then the inverse function cannot be defined uniquely.
So, swap the variables: y=x2−1 becomes x=y2−1
Now, solve the equation x=y2−1 for y.