- #1
coookiemonste
- 24
- 0
Homework Statement
If the graph of y=x^3+ax^2+bx-8 has a point of inflection at (2,0), what is the value of b?
the answer is 8.
Homework Equations
The Attempt at a Solution
y'=3x^2+2ax+b
y''=6x+2a
Let y''=0=6x+2a then i plugged in 2 for x
and got -6=a
So y'=3x^2-12x+b...
I don't know where to go from here.