anonymous
  • anonymous
.
Mathematics
chestercat
  • chestercat
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anonymous
  • anonymous
anonymous
  • anonymous
Given f(x)=2x^2+8 and g(x)=5x -6
anonymous
  • anonymous
please solve this

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anonymous
  • anonymous
(2x^2+8)+(5x -6 )
anonymous
  • anonymous
What do I do do I multiply 2x and 5x?
anonymous
  • anonymous
no. 2x^2 and 5x ar not lik terms because they do not have same power of x
anonymous
  • anonymous
Do I need a graphing calculator to solve this?
anonymous
  • anonymous
Oh.
anonymous
  • anonymous
now the answer will be \[ 2x^2+ 5x +2\]
anonymous
  • anonymous
(f+g)(x)= f(x)+g(x) = 2x^2 +8 + 5x-6 = 2x^2+ 8 +1
anonymous
  • anonymous
Oh. . . How confusing it shows it this way in the book.
anonymous
  • anonymous
2x^2+ 8 +1 is very wrong
anonymous
  • anonymous
Ahh. . . Okay then. I will follow your lead, what's next?
anonymous
  • anonymous
i have given the answer to that
anonymous
  • anonymous
Oh okay. I will try the second one on my own you tell me if it's correct.
anonymous
  • anonymous
2x^2*5x+2
anonymous
  • anonymous
you there?
anonymous
  • anonymous
\[(2x^2+8)(5x -6 ) =\]
anonymous
  • anonymous
\[2x^2*5x -2x^2*6 +5x*8-8*6\]
anonymous
  • anonymous
\[10x^3-12x^2+40x-48 \]
anonymous
  • anonymous
that would be the answer

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