crystallucas1 crystallucas1
  • 01-06-2017
  • Mathematics
contestada

If (f + g)(x) = 3x2 + 2x – 1 and g(x) = 2x – 2, what is f(x)?
3x2 + 1
3x2 – 1
3x2 + 4
3x2 – 4
x2 – 2

Respuesta :

morgaine816
morgaine816 morgaine816
  • 01-06-2017
To find f(x) we subtract g(x) from (f+g)(x):
[tex]3 x^{2} +2x-1-(2x-2) \\ 3 x^{2} +2x-1-2x+2 \\ 3 x^{2} +1[/tex] Distribute the negative across the parentheses and then combine like terms. The 2x gets cancelled out and we are left with [tex]A. 3 x^{2} +1[/tex]

Hope that helps.
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