The equation of the given curve is y=x3-3x2-9x+7.
\(\frac{dy}{dx}\)=3x2-6x-9
Now, the tangent is parallel to the x-axis if the slope of the tangent is zero.
3x2-6x-9=0 ⇒ x2-2x-3=0
=(x-3)(x+1)=0
=x=3 or x=-1
When x = 3, y = (3) 3 − 3 (3) 2 − 9 (3) + 7 = 27 − 27 − 27 + 7 = −20.
When x = −1, y = (−1) 3 − 3 (−1) 2 − 9 (−1) + 7 = −1 − 3 + 9 + 7 = 12.
Hence, the points at which the tangent is parallel to the x-axis are (3, −20) and (−1, 12).
If \( x = a(0 - \sin \theta) \), \( y = a(1 + \cos \theta) \), find \[ \frac{dy}{dx}. \]
Find the least value of ‘a’ for which the function \( f(x) = x^2 + ax + 1 \) is increasing on the interval \( [1, 2] \).
If f (x) = 3x2+15x+5, then the approximate value of f (3.02) is
m×n = -1