Problem+10+Elana+and+Jana

Jana

f(x)=4x^3+ 3x^2-6x+1 f'(x)= 12x^2 +^x-6

6(2x^2+x-1)=0 (2x-1) (x+1)=o x= -1 and 1/2 (max and mins)

f''(x) __++__ -1 __- - -__  1/2 __++++__ (number line) increasing max decrasing min inreasing

F''(x) =24x+6 6(4x+1)= 0 x= -1/4 f''(x) __- - - -__ -1/__4 ++++__ concave down pt.Inflect concave down