Factorise 15r+10

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Step 1) look at the numbers 

Both 15 and 10 are factors of 5

step 2 ) look at the letters 

there is only one letter 'r' after the 15 

step 3) there is only one possible thing that can be factorised out 

therefore the answer must be

5(3r+2) 

Judy L. A Level Further Mathematics  tutor, GCSE Further Mathematics ...

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is an online GCSE Maths tutor with MyTutor studying at Imperial College London University

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