This is a quadratic in . Use the substitution
Solve for y
Re-substitute to calculate the value(s) of x
Let denote the tangent point on the graph of f.
The slope of the tangent is
The equation of the tangent in T is:
This tangent has to pass through P(1, -3) that means the coordinates of P have to satisfy the equation of the tangent:
You get two tangent points and two tangents: