the area of a certain triangle can be expressed using the trinomial 6x^2+x-1.
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Area of triangle is ½bh where b=base length, h=height.

½bh=½(3x-1)b=6x²+x-1, which factorises: (3x-1)(2x+1).

So b/2=2x+1, and b=4x+2.

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