Solve for a : 6( a-1)^2 -9 (a-1) -42

Answer 1

6( a-1)^2 -9 (a-1) -42
2(a-1)^2 - 3(a-1) - 14 = 0
((a-1)+2)(2(a-1)-7) = 0
think you can take it from there?

Answer 2

6 (a^2 - 2a + 1) - 9a + 9 - 42 ... 6a^2 - 12a + 6 - 9a - 33 ... 6 a^2 - 21 a - 27

2 a^2 - 7 a - 9 ... (2a - 9) (a + 1)