MATH 1300.03F D **Quiz 4** Friday,
October, 15 1999

NAME:

Student Number: No.Marks

**(2 Marks)**
Find the equation of the tangent line of at (1,4).

Solution: Since *f*'(*x*)=8*x*+1 for , *f*'(1)=9. Hence,
the equation of the tangent line of *f* at (1,4) is *y*=9(*x*-1)+4=9*x*-5.

Wed Oct 20 14:38:45 EDT 1999