Write 3a - a x 4a + 2a in its simplest form.

= 5a - 4a^2The rules of BODMAS (brackets, Orders, Division, Addition, Subtraction) applies. Times the "a" with "-4a" first, forming 4a squared (4a^2). Then group the "3a" and "2a" together, add them up, whcih equals 5a.