the knife needs sharpening or sharpening
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Example 3 Solve the equation x2 – 7x = 0 Factorising , x ( x – 7 ) = 0 either r = 0 orx - 7 = 0 x = 7 The solutions are x = 0 and x = 7 . ( a ) Solution by ...
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The knife needs sharping
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