expand and simplify the following expressions

Bonjour ;

a)

2(6x + 1) = 2 * 6x + 2 * 1 = 12x + 2 .

c)

3(2x - 6y) = 3 * 2x + 3 * (- 6y) = 6x - 18y .

e)

4(- 5a - 6) = 4 * (- 5a) + 4 * (- 6) = - 20a - 24 .