Question 703308
Question #1 - Add the fractional polynomials
{{{2/((x+3))}}} + {{{3/((x^2+7x+12))}}}
the 2nd denominator cannot be factored; the common denominator is (x+3)(x^2+7x+12), so be have
{{{(2(x^2+7x+12)+3(x+3))/((x+3)(x^2+7x+12))}}}
{{{((2x^2+14x+24+3x+9))/((x+3)(x^2+7x+12))}}} = {{{((2x^2+17x+33))/((x+3)(x^2+7x+12))}}}; about all you can do with it
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Question #2 - multiply the fractional polynomials
{{{((2x-3))/((x+3)^2)}}} * {{{((x^2+4x+3))/((4x^2-9))}}}
Factor 
{{{((2x-3))/((x+3)(x+3))}}} * {{{((x+3)(x+1))/((2x+3)(2x-3))}}}
Cancel (2x-3)s and (x+3)s, then multiply
{{{1/((x+3))}}} * {{{((x+1))/((2x+3))}}} = {{{((x+1))/((x+3)(2x+3))}}} = {{{((x+1))/((2x^2+9x+9))}}}