Problem

Find the directional derivative of $αx,y.z\right)=x^{2}yx+4x$ $at$
$\left(1-21\right)$ in the direction of $2i-1-2k$

Algebra

Search count: 116

Solution

Qanda teacher - Bhanu

Student

sir r u sure about this answer??

sir answer is -13/3

which one is correct

Qanda teacher - Bhanu

you can see the solution

Answer given in book is many a times wrong.

You shouldn't believe blindly

better to go with solution

Student

sir I asked it to my mam...they give me this answer

Qanda teacher - Bhanu

There might be some calculation mistake, let me check again. But, procedure is 200%correct.

Student

sir I tried using my mams method ...is this correct??

which method is this??

Qanda teacher - Bhanu

I am not getting this method

seems to be correct

Student

but they teach us only this method

Qanda teacher - Bhanu

There are many methods

teachers used to teach as per their convenience

I have also choosen as per my convenience

Student

this is the problem of engineering mathematics 3

Qanda teacher - Bhanu

There is no hard and fast rule

yeah I understand

Student

kk sir ...thanku for your kind information

Qanda teacher - Bhanu

welcome

Still don't get it?

Ask this question to Qanda teacherSimilar problem

b) $\right)$ Find the directional derivative of $y\left(x,y,=\right)=xy^{3}+yz^{3}$ at the point $\left(2,-1,-3\right)$ in the
direction of vector $2i$ $-3\bar{i} +42\bar{k} $ $\left(6M\right)$

Calculus

Search count: 107