D. 686
ExplanationStep 1: the critical point for maximum is x=-7. Step 2: f(-7)=(-7)^3-349(-7)=686. Step 3: tip: for x^3-3a^2x, maximum value is 2a^3.
Step 1: critical point for maximum x=-7 है। Step 2: f(-7)=(-7)^3-349(-7)=686। Step 3: tip: x^3-3a^2x में maximum value 2a^3 होती है।
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