Question 780199

f(x)=2x^2+x
What is f(x+3)?
Is it 2x^2+x+21?
 Thank you!


{{{f(x) = 2x^2 + x}}}


{{{f(x + 3) = 2(x + 3)^2 + x + 3}}}


{{{f(x + 3) = 2(x^2 + 6x + 9) + x + 3}}}


{{{f(x + 3) = 2x^2 + 12x + 18 + x + 3}}}


{{{highlight_green(f(x + 3) = 2x^2 + 13x + 21)}}}......Different from yours.