exam Maths Puzzle Numerical Ability

Science and technology. Fungicides account for 1/10 of the pesticides used in the United States. Insecticides account for 1/4 of all the pesticides used in the United States. The r

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Factor completely: x^3 - 2x^2 - 4x - 8

I have come up with varying answers for this problem, so am probably not working it correctly. Could you please show me the steps involve can you please help me on solving this equation...

find the value of the polynomial x^3 - 4x when x = -2