Question 996210


if {{{ f(x)=3x^2+x-1}}} and {{{g(x)=4x+5}}},then

{{{(gf)(x)=(3x^2+x-1)(4x+5)}}}

{{{(gf)(x)=3x^2*4x+x*4x-1*4x+5*3x^2+5x-5}}}

{{{(gf)(x)=12x^3+4x^2-4x+15x^2+5x-5}}}

{{{(gf)(x)=12x^3+19x^2+x-5}}}

so your answer is: C. {{{12x^3+19x^2+x-5}}}