Check the attached file for the solution.
Answer:
Step-by-step explanation:
It would be A, the first one.
The derivative of f(x) at x=3 is 2x=6 approaching from the left side (apply power rule to y=x^2). The derivative of f(x) at x=3 is m approaching from the right side. In order for the function to be differentiable, the limit of derivative at x=3 must be the same approaching from both sides, so m=6. Then, x^2=mx+b at x=3, plug in m=6, 9=18+b, so b=-9.
7.5, 50.6 minus 5.8 =44.8, divide this by 6, 7.44 recuring 7
