Given the function f (x) = 14x4 − X3 + x2 + a (0 & lt; X ≤ 6); (1) find the monotone interval and the maximum value of the function; (2) when a is the value, the equation f (x) = 0 has three different real roots

Given the function f (x) = 14x4 − X3 + x2 + a (0 & lt; X ≤ 6); (1) find the monotone interval and the maximum value of the function; (2) when a is the value, the equation f (x) = 0 has three different real roots

(1) F ′ (x) = x3-3x2 + 2x = 0 {x = 0,1,2 x (0,1) 1 (1,2) 2 (2,6) f ′ (x) & gt; 0 0 & lt; 0 & gt; 0 f (x) increases the maximum value 14 + a decreases the minimum value a increases. Therefore, f (x) increases on (0,1) and decreases on (...)