Differentiate: $f ( x ) = \left( x ^ { 2 } + 1 \right) ( x + 6 )$
A) $x ^ { 2 } + 1$
B) $3 x ^ { 2 } + 12 x + 1$
C) 2x + 1
D) 12x + 1

Question

Quizplus · Accepted Answer

To differentiate $f(x) = (x^2 + 1)(x + 6)$, we use the product rule: $(u \cdot v)' = u' \cdot v + u \cdot v'$. Let $u = x^2 + 1$ and $v = x + 6$. Then, $u' = 2x$ and $v' = 1$. Applying the product rule, we get $f'(x) = (2x)(x + 6) + (x^2 + 1)(1) = 2x^2 + 12x + x^2 + 1 = 3x^2 + 12x + 1$.

Differentiate f(x)=(x2+1)(x+6)f ( x ) = \left( x ^ { 2 } + 1 \right) ( x + 6 )f(x)=(x2+1)(x+6)

Differentiate $f ( x ) = \left( x ^ { 2 } + 1 \right) ( x + 6 )$