What is the greatest common multiple of 6 and 24

Simply 8x squared + 5(7x squared- x) - 2x =

Can someone me and do the problem plz so i can understand it more better

Amir wants to proportionally increase the size of a photo to create a poster for his room. the size of the original photo is shown. complete the statement and then answer the question to represent ways that amir can increase the size of his photo.