A-Level Edexcel Core Maths C1 June 2010 Q9a : ExamSolutions

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Because you were asked to form an equation rather than an expression so you had to equal it to something.

ExamSolutions_Maths
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Why would you need to need to put it equals to 40.75
can't you just leave it as
a + 29d ??
Thanks! And great work!

ChromeAutomaton