I. x2=49

    II. y2-4y-21=0

  • If x ≤ y
  • Ifx ≥ y
  • If relationship between x and y can not be established
  • If x < y
  • If x > y
  • Explanation:

    I. x2=49

    x=±7

    II. y2-4y-21=0

    y2-7y+3y-21=0

    y(y-7)+3(y-7)=0

    (y+3)(y-7)=0

    y=-3,7

    ∴ x ≤ y


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I. x2=49 II. y2-4y-21=0
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