anonymous
  • anonymous
Why is 13 and -5 the wrong answer?
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
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anonymous
  • anonymous
1 Attachment
anonymous
  • anonymous
ill type it out if you cant see it
amistre64
  • amistre64
cant see it

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anonymous
  • anonymous
where did you get the 13 from?
anonymous
  • anonymous
take the derivative, replace x by 1 and you should get 10 if i am not mistaken
anonymous
  • anonymous
For the function f(x) = 5x^2+3, find the equation of the tangent line to the graph of f at x=1. If the equation of the tangent line is written as: y=mx+b, what are m and b? m= b=
amistre64
  • amistre64
find f(1) to establish the point and find f'(1) to establish a slope
amistre64
  • amistre64
then y = mx + b y = f'(1)x -f'(1)+f(1)
anonymous
  • anonymous
i got 13 by getting 10(1)+3
amistre64
  • amistre64
5(1)+3 = 8
amistre64
  • amistre64
5(1^2) not= 10
amistre64
  • amistre64
..... youre talking the derivative tho lol
amistre64
  • amistre64
derivative of 5x^2+3 is 10x 10(1) = 10
anonymous
  • anonymous
i am going to guess that the mistake was in taking the derivative and getting \[y'=10x+3\] instead of the correct \[y'=10x\] just a guess
amistre64
  • amistre64
y = 10x -10+8 y = 10x -2
anonymous
  • anonymous
what amistre said
anonymous
  • anonymous
yeah my mistake was that i kept the 3 after taking the derivative
amistre64
  • amistre64
\[D_x[5x^2+3]=Dx[5x^2]+Dx[3]=10x + 0\]
anonymous
  • anonymous
thanks

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