Question

24. Find the intervals in which the function given by
f(x) = - 2x - 9x2 - 12x + I is 1 is (i) increasing
(ii) decreasing.
OR
Find the equation of tangent to the curve y=x+
4x + 1 at x = 3. Also find the point where the
tangent the curve is parallel to x-axis.​

Answer 1

for increasing derivative of f>0