exam Maths Puzzle Numerical Ability

Please help us find the Factor and show any formula that you used.

5cx2 + 10c2x - 15c3

Thank you for any help that you can give.

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exam Other Question

i am sorry to bug again but this chapter is really hard and i cant understand it so can you please help me again with the same questions which is adding and then simplifying the th 8/5-(-9)=7/2-5