A is the answer. Hope this helps!
Answer: Decimal Form: 4.47213595
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Answer is in a photo. I couldn't attach it here, but I uploaded it to a file hosting. link below! Good Luck!

Factor the following:
x^2 - 4 x + 3
The factors of 3 that sum to -4 are -1 and -3. So, x^2 - 4 x + 3 = (x - 1) (x - 3):
Answer: (x - 1) (x - 3)