What equation results from completing the square and factoring x2+2*=9

A. (*+1) ^2=10

B. (*+2) ^2=8

C. (*+2) ^2=10

D. (*+1) ^2=8

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2x + y = 10 -4x + 5y = 22

How is multiplying 0.3 by 10 like multiplying 0.3 by 0.01? how is it different?