exam Maths Puzzle Numerical Ability

(x-1)(X^2+x-1)=0

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exam Other Question

Factor each polynomial completely:
8x3(x to the third) - 27
I tried, (4x +9)(2x-3) is that close
8x2(x squared) +-12x +-18x -27
I need to draw a construction and prove with reasons that trapezoid MN=one half (AB+DC) MN 11 DC 11 AB asap. please help.
thanks
I used the 11 for parallel