A calculus problem by Denton Young

Calculus Level 1

Let f ( x ) = 2 x 2 + 3 x + 1 f(x) = 2x^2 + 3x + 1 .
Find f ′ ( 3 ) f'(3) .


The answer is 15.

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Denton Young by Denton Young , 47, USA

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2 solutions

Denton Young
Aug 3, 2016

f ′ ( x ) = 4 x + 3 f'(x) = 4x + 3

(4*3) + 3 = 15

2 Helpful 0 Interesting 0 Brilliant 0 Confused
Kaushik Chandra
Oct 8, 2016

f (x)=2x^2+3x+1 df(x)/dx=2×2x^2-1 +1×3x^1-1 +0 [as d (constant)=0 4x+3+0= 4×3+3=15

0 Helpful 0 Interesting 0 Brilliant 0 Confused

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