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2015-02-08T12:13:16+05:30

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given, y²+y-132 = 0
          y²+12y-11y-132 = 0
         y(y+12) - 11(y+12) = 0
          (y-11)(y+12) = 0
          y-11 = 0   or   y+12 = 0
          y=11  or  y = -12
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