If f: R rightarrow R is a function defined fo | vedclass

Name: Exam Paper Generator | JEE NEET Paper Generator | Vedclass
Brand: Vedclass
Rating: 5 (35 reviews)

Question

(C) Given $f(x) = x^3 + ax^2 + bx + c$,where $a = f^{\prime}(1)$,$b = f^{\prime \prime}(2)$,and $c = -f^{\prime \prime \prime}(3)$.First,find the deri

Vedclass · Accepted Answer

$45$

Vedclass · Answer

(C) Given $f(x) = x^3 + ax^2 + bx + c$,where $a = f^{\prime}(1)$,$b = f^{\prime \prime}(2)$,and $c = -f^{\prime \prime \prime}(3)$.First,find the derivatives: $f^{\prime}(x) = 3x^2 + 2ax + b$,$f^{\prime \prime}(x) = 6x + 2a$,$f^{\prime \prime \prime}(x) = 6$.Now,solve for constants:$f^{\prime \prime \prime}(3) = 6$,so $c = -6$.$f^{\prime \prime}(2) = 6(2) + 2a = 12 + 2a$. Since $b = f^{\prime \prime}(2)$,we have $b = 12 + 2a$.$f^{\prime}(1) = 3(1)^2 + 2a(1) + b = 3 + 2a + b$. Since $a = f^{\prime}(1)$,we have $a = 3 + 2a + b$.Substitute $b = 12 + 2a$ into the equation for $a$: $a = 3 + 2a + (12 + 2a) \Rightarrow a = 15 + 4a \Rightarrow -3a = 15 \Rightarrow a = -5$.Then $b = 12 + 2(-5) = 2$.So,$f(x) = x^3 - 5x^2 + 2x - 6$.At $x=0$,$y = f(0) = -6$. The point is $(0, -6)$.Slope $m = f^{\prime}(0) = 3(0)^2 - 10(0) + 2 = 2$.Tangent at $(0, -6)$ is $y - (-6) = 2(x - 0) \Rightarrow y = 2x - 6$. $X$-intercept is $3$.Normal at $(0, -6)$ is $y - (-6) = -\frac{1}{2}(x - 0) \Rightarrow y = -\frac{1}{2}x - 6$. $X$-intercept is $-12$.The triangle is formed by the points $(0, -6)$,$(3, 0)$,and $(-12, 0)$.Base length $= 3 - (-12) = 15$. Height $= |-6| = 6$.Area $= \frac{1}{2} 	imes 15 	imes 6 = 45$ sq. units.

If $f: R \rightarrow R$ is a function defined for all $x \in R$ by $f(x)=x^3+f^{\prime}(1) x^2+f^{\prime \prime}(2) x-f^{\prime \prime \prime}(3)$,then the area (in sq. units) of the triangle formed by the $X$-axis,the tangent,and the normal drawn to the curve $y=f(x)$ at $x=0$ is

Similar Questions

The equation of the tangent to the curve $6y = 7 - x^3$ at the point $(1, 1)$ is:

The length of the subtangent,ordinate,and the subnormal are in

The equation of the normal to the curve $2x^{2} + y^{2} = 12$ at the point $(2, 2)$ is

If $ab \neq 0$,then the equation of the tangent at $(a, b)$ to the curve $\left(\frac{x}{a}\right)^n + \left(\frac{y}{b}\right)^n = 2$ is

If the point $P(x_1, y_1)$ lying on the curve $y = x^2 - x + 1$ is the closest point to the line $y = x - 3$,then the perpendicular distance from $P$ to the line $3x + 4y - 2 = 0$ is

Vedclass Test Series

Exam Paper Generator

Online Exam Module