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2014-07-12T15:22:12+05:30

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1)    x² - 3x +5 - 1/2(3x² - 5x +7) 
       = x² - 3x +5 - 3/2x² +5x - 7
       = - 1/2x² +2x - 2
2)    [5 - 3x +2y - (2x - y)] - (3x - 7y +9)
      = [ 5 - 3x +2y - 2x + y] - 3x +7y - 9
      = 5 - 5x + 3y - 3x +7y - 9
      = - 8x +2y - 4 
2 5 2
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Please last ok
Xcube y(xsq-2x)+2xy(Xcube X4)
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