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  1. J

    maths p3 - deciding range of inequality after solving it

    when using quadratic equation formula on inequalities don't use "equals to sign" ("= ") use the sign assigned in the inequality for example for the inequality 5x^2 +30x -35 < 0, the answer using quadratic equation must be written as x < 1 and x > -7 not x= 1 and x= 7 for the sign...
  2. J

    Math P3 Urgent help.

    For May/June 2003 Q9(II) solve the planes to find the intersecting point....the planes are x+2y-2z= 2 and 2x-3y+6z= 3 To solve the equation suppose one of the variable as 0 , i suppose z = 0 so the equations now become x + 2y = 2 and 2x - 3y = 3, now solve them both using the linear equation...
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