To factorise this expression, look for the HCF of \(6x\)and 9 which is 3. To factorise, write down the HCF and then begin a set of brackets. Find the missing terms in the brackets by dividing each of ...
An iron nail is placed in a solution of blue copper(II) sulfate. Over time, a brown solid appears and the solution becomes colourless. This is because copper and a solution of iron(II) sulfate forms.
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