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Using the Factor theorem, show that (i) (x-2) is a factor of x^(3)-2x^(2)-9x+18. Hence factorise the expression x^2-2x^2-9x+18 completely. (ii) (x+5) is a factor of 2x^3+5x^2-28x-15. Hence factorise the expression 2x^3+5x^2-28x-15 completely. (iii) (3x+2) is a factor of 3x^(3)+2x^(2)-3x-2. Hence factorise the expression 3x^3+2x^2-3x-2 completely. |
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