If #f(x) = 3x + 5# and #g(x) = x^2#, what is #f(x) + g(x)#?

1 Answer
KillerBunny
Jun 20, 2018

#x^2+3x+5#

Explanation:

You can simply add the definition of the function: starting from

#f(x)+g(x)#

substitute #f(x)# with its definition #3x+5#, and #g(x)# with its definition #x^2# to get

#color(red)(f(x))+color(blue)(g(x)) = color(red)(3x+5)+color(blue)(x^2)#

If you prefer, you can rearrange the polynomial in the usual order:

#x^2+3x+5#

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