You have to find x intercept of this question

Step 1: Transform the cubic equation into a depressed cubic.
The given equation is $x^3 - 3x^2 - 9x - 7 = 0$.
To transform this into a depressed cubic of the form $y^3 + py + q = 0$, we use the substitution $x = y - \frac{b}{3a}$.
For our equation, $a=1$ and $b=-3$.
So, the substitution is $x = y - \frac{-3}{3(1)} = y + 1$.

Substitute $x = y+1$ into the original equation:

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