It is a quadratic expression in x, which is equivalent to 3*(x+1)*(x+5). Since it is not an equation it cannot be solved.
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It has one double solution.
Divide all terms by 3 and so x2+18x+81= (x+9)(x+9) when factored
(x+3)(x+15)
(2x4) + (8x3) + 18x 8 + 24 + 18x 32 + 18x
x2 + 18x + 45 = (x + 15)(x + 3).