exam Maths Puzzle Numerical Ability

Please show me how to factorise the following cubic equation
-2x^3 + 3x^2 - 3

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exam Other Question

Find the slope of any line perpendicular to the line through points (2, 11) and (3, 4). there are 12 trumpet players in the marching band, but there is only room for 3 of them in the jazz band. how many diffrent combinations of trumpet players could be selected for the jazz band out of the 12?
a. 1728
b. 36
c. 1320
d. 220