Question

If $f(x)=x^4-x^3+7x^2+14$, then what is the value of $f^{\prime }(5)$ ?

• A. 594
• B. 549
• C. 954
• D. 495

Answer 1

Answer: (D)

Since, $f(x)=x^4-x^3+7x^2+14$
Then, $f^{\prime }(x)=4x^3-3x^2+14x$
$\therefore f^{\prime }(5)=500-75+70=495$