Iff

(

x

)

=

3

x

2

7

x

+

5

f(x)=3x2-7x+5

, findf

'

(

5

)

f(-5)

.

Use this to find the equation of the tangent line to the parabolay

=

3

x

2

7

x

+

5

y=3x2-7x+5

at the point(

5

,

115

)

(-5,115)

. The equation of this tangent line can be written in the formy

=

m

x

+

b

y=mx+b

wherem

m

is:

and whereb

b

is:

Q 2.

Iff

(

x

)

=

6

+

3

x

+

4

x

2

f(x)=6+3x+4x2

, findf

'

(

x

)

f(x)

.

Findf

'

(

3

)

f(3)

.