Multiply the following two binomials.

1. (6x - 1)
2. (-3x + 1)

(6x - 1)(-3x + 1)

= 6x(-3x) + 6x(1) - 1(-3x) - 1(1)
= -18x^2 + 6x + 3x - 1
= -18x^2 + 9x - 1