Since you cannot multiply x by a, in the answer you get ax.
2a * 3x = 6ax
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2a2
3x * (x - 4) = 3x*x - 3x*4 = 3x^2 - 12x.
The height of an equilateral triangle is √3/2 x side_length. So for an equilateral triangle of side length 2a, the area is: area = 1/2 x base x height 1/2 x (2a) x (√3/2 x 2a) = √3 a2
x2=(4a)(a) x=√4a2 x=2a The geometric mean of a and 4a is 2a