Express as trinomial
(3x-9)(x+4)
Using the distributive property, we can expand the expression as follows:
(3x - 9)(x + 4) = 3x(x) + 3x(4) - 9(x) - 9(4)
= 3x^2 + 12x - 9x - 36
= 3x^2 + (12x - 9x) - 36
= 3x^2 + 3x - 36
So, the expression (3x-9)(x+4) can be expressed as the trinomial 3x^2 + 3x - 36.