Hard Math Class 12 Level 5

For f(x)=x^3-349x, at which x will the local maximum occur?

f(x)=x^3-349x के लिए local maximum किस x पर होगा?

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Correct Answer

A. -7

Explanation

Step 1: derivative is f'(x)=3x^2-349. Step 2: critical points are x=±7; f''(x)=6x, so at x=-7 it is negative and gives local maximum. Step 3: tip: for x^3-3a^2x, maximum is at -a and minimum is at a.

Step 1: derivative f'(x)=3x^2-349 है। Step 2: critical points x=±7; f''(x)=6x होता है, इसलिए x=-7 पर f'' negative है और local maximum है। Step 3: tip: cubic x^3-3a^2x में maximum -a पर और minimum a पर होता है।

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