exam Maths Puzzle Numerical Ability

I am a teacher/mom trying to help my 9th grade son. I have redone 3 different problems about 3 times each. This is one of them. Help!

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Factor Completely. x^2 - 2x +1

I am having trouble solving this problem and need some help. Thanks Prove the indicated results:
Two lines intersected by a third line are parallel if the sum of the two interior angles on the same side of the transversal is equal to two right ang