The question contains an expression, not an equation and so there is no solution.
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2x2+18x = 20 2x2+18x-20 = 0 x2+9x-10 = 0 (x+10)(x-1) = 0 x = -10 or x = 1
3x2 - 7x - 20 = (3x + 5)(x - 4)
An icosagon is a 20 sided polygon that has 20 vertices which is the plural of vertex
11x = 20x +1811x-20x=18x(11-20)=18-9x=18x=-2
(3x-4)(x+5)