exam Maths Puzzle Numerical Ability

factor:

4x^3-8x^2-x+2

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exam Other Question

write 5c^3w/2bd^3+3z^2/10c^3d as a single expression I drew the pentagon and not sure if I found all the triangles, I found 20 is this right or are there more. Heres the question. Thanks for your help.

Draw a pentagon with each of its five diagonals. How many triangles are contained in the figure?