- #1
hamburgler
- 22
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I'm doing a calc BC practice exam and I found this question that stumps me to the max:
The function y=x^4+bx^2+8x+1 has a horizontal tangent and a point of inflection for the same value of x. What must be the value of b?
I know that points of inflection are found from the second derivative and setting that function to zero, however the 'b' value really throws me off
Oh btw here are the mc answers.
a) -6 b)-1 c) 1 d) 4 e) 6
The function y=x^4+bx^2+8x+1 has a horizontal tangent and a point of inflection for the same value of x. What must be the value of b?
I know that points of inflection are found from the second derivative and setting that function to zero, however the 'b' value really throws me off
Oh btw here are the mc answers.
a) -6 b)-1 c) 1 d) 4 e) 6