Question: Let f ( x ) = 7 x 5 8 x 4 + 2 x 4. (a) Find the interval where f is concave up.

Letf(x) = 7x5 8x4+ 2x 4.

(a)Find the interval wherefis concave up.

The answer is of the form(a,b). Enter the values ofaandb(in that order) into the answer box below, separated with a comma.

(b)Find thex-coordinate of the inflection point off.

(Iffhas no inflection point then enterDNE)

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