Hello,

you have:

and the equation of a tangent line:

1. Calculate the coordinates of the tangent point for x = 1. Plug in this value into the equation of the tangent line: T(1, 1)

Plug in these values into the equation of the function because the coordinates of the tangent point must satisfy the equation of the function too:

2. The slope of the tangent line is m = 2 and is equal to the first derivatie of f at x = 1. Calculate the first derivatie. I took the 2nd version of the term of the function:

. Thus

3. Solve the system of simultaneous equations for a and b. I've got a = 4 and b = -3