Question 1125997
{{{r(x)=4x-2}}}
{{{s(x)=x+3}}}

Write the expressions for 
{{{(s*r)(x)= s(x)*r(x)}}}
{{{(s*r)(x)=(x+3)(4x-2)}}}
{{{(s*r)(x)=4x^2 + 10x - 6}}}


and 

{{{(s-r)(x)=s(x)-r(x)}}}
{{{(s-r)(x)=x+3-(4x-2)}}}
{{{(s-r)(x)=x+3-4x+2}}}
{{{(s-r)(x)=-3x+5}}}



 evaluate {{{(s+r)(3)}}}


to do it, first find {{{(s+r)(x)}}}


{{{(s+r)(x)=s(x)+r(x)}}}
{{{(s+r)(x)=x+3+(4x-2)}}}
{{{(s+r)(x)=x+3+4x-2}}}
{{{(s+r)(x)=5x+1}}}

then

{{{(s+r)(3)=5*3+1}}}
{{{(s+r)(3)=16}}}