You can use the 5 steps below to find the inflection points of a function: Step 1 Differentiate f (x) f (x) to find f’ (x) f ’(x). Then, differentiate f’ (x) f ’(x) to find f’’ (x) f ’’(x) . Step 2

The derivative is y' = 15x2 + 4x − 3. The second derivative is y'' = 30x + 4. And 30x + 4 is negative up to x = −4/30 = −2/15, positive from there onwards. So: f (x) is concave downward up to x =