exam Maths Puzzle Numerical Ability

Factor; 4a^2-4a+1
I did it just like by this problem; a^2-9= a^2-3^2= (a+3)(a-3, but it was wrong.

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exam Other Question

Can someone show me how to write the rational expression in lowest terms?


3s^2-9st-54t^2/3s^2-6st-72t^2
(2,y),(4,5),m=2