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expanding algebraic expressions dont worry its not as complicated as it sounds first some revision so we have an expression 2a plus 3b 2a is a term and 3b is a term if we have 2a plus 3a youll notice that the letters are the same they both have as in them these are what we call like terms because the letters are the same if we have like terms like this we can add them together so we get 2 a plus 3 a equals 5 a same thing with 2 a squared plus 3 a squared these are like terms so we can add them together to make 5a squared if we have 2a X plus 3 a youll notice the letter combinations here are not the same so these are unlike terms and we cant add them up so 2 with 2a squared plus 3a even though theyre all As the 2a squared is different to the a so we cant add them up and they are also unlike terms ok so say were asked to expand 3 outside of X plus 2 that means that the 3 needs to be multiplied by both terms inside the bracket so 3 needs to be multiplied by the X and also by th