A: For this equation, follow BIDMAS, so first multiply each value inside the brackets by 4: = 4*3x + 4*2 - 2 ("*" meaning multiply) = 12x + 8 - 2 = 12x +6 And I think you're done. B: For this you need to put in brackets, so find the highest common factor of the values and put it outside the brackets: Both 20 and 16 are divisible by 4 so 4(5b - 4) So that when you multiply out the brackets you get back to 20b - 16. Hope his helps.
