Michael J. answered 01/30/17
Tutor
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(5)
Effective High School STEM Tutor & CUNY Math Peer Leader
These are your two point:
P1(0 , 0) and P2(x , x2 - 3)
d = √[(0 - x)2 + (0 - (x2 - 3))2]
d = √[x2 + (-x2 + 3)2]
d = √[x2 + (-x2 + 3)(-x2 + 3)]
d = √(x2 + x4 - 6x2 + 9)
d = √(x4 - 5x2 + 9)