exam Maths Puzzle Numerical Ability

factor the polynomial 4a^2-4ac+4c^2, please

Also factor 16a^2-9c^2

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exam Other Question

when doing this problem can you use the cross multiply method or do you use the LCM/LCD method. I tried to do the cross mulitply method but the answer did not turn out right.....Can you help A sailboat travels 20 miles downstream in 3 hours. It returns in 4 hours. Find the speed of the sailboat in still water and the rate of the current.