Math

7r^2 -14r=-7 Solve

Asked by AnneS2 on 15 May 05:26

Last updated by anonymous on 16 May 14:10

1 Answers

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Answered by CherieS on 16 May 14:10

7r^2 -14r=-7

7r^2 -14r+7=-7 +7

7r^2 -14r+7=0

7( r^2-2r+1)=0

7 (r )(r ) ( -1)( -1)

7(r-1)(r-1)=0

7 (r-1)^2 = 0

Solve:

7(r-1)=0

7(r) (7)(-1)=0

7r-7=0

7r-7+7=0+7

7r=7

7r/7=7/7

r=1