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Mathswatch is very fussy Q) The base of an open rectangular box is the length (2x+7) cm and width x cm The area of this base is 57cm² The height of the open box is (x-1) cm. Show that 2x²+7x-57=0 x(2x+7)=57 (I get 1 mark for doing this bit) 2x²+7x=57 2x²+7x-57=0 (These two steps don't count for the 2 mark)
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