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Find the points of inflection of the graph of the function. (If an answer does not exist, enter DNE. ) f(x) = 15 x4 + 4x3 (x, y) = ( ) smaller x-value (x, y) = ( ) larger x-value ) larger x-value Describe the concavity. Concave upward: (−∞, −10)∪(0, ∞) (−∞, 0)∪(10, ∞) (−10, 0) (0, 10) none of these Concave downward: (−∞, −10)∪(0, ∞) (−∞, 0)∪(10, ∞) (−10, 0) (0, 10) none of these

Find the points of inflection of the graph of the function. (If an answer does not exist, enter DNE. ) f(x) = 15 x4 + 4x3 (x, y) = ( ) smaller x-value (x, y) = ( ) larger x-value ) larger x-value Describe the concavity. Concave upward: (−∞, −10)∪(0, ∞) (−∞, 0)∪(10, ∞) (−10, 0) (0, 10) none of these Concave downward: (−∞, −10)∪(0, ∞) (−∞, 0)∪(10, ∞) (−10, 0) (0, 10) none of these

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Find the points of inflection of the graph of the function. (If an answer does not exist, enter DNE.)
f ( x ) = 1 5 x 4 + 4 x 3 ( x , y ) = ( ◻ ) smaller x -value ( x , y ) = ( ◻ ) larger x -value
) larger x -value
Describe the concavity.
Concave upward: ( − ∞ , − 10 ) ∪ ( 0 , ∞ ) ( − ∞ , 0 ) ∪ ( 10 , ∞ ) ( − 10 , 0 ) ( 0 , 10 ) none of these
Concave downward: ( − ∞ , − 10 ) ∪ ( 0 , ∞ ) ( − ∞ , 0 ) ∪ ( 10 , ∞ ) ( − 10 , 0 ) ( 0 , 10 ) none of these

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