Question

PLS HELP

Let f(x) = -6x + 3 and g(x) = 5x + 4. Find f · g and state its domain.


A) -30x2 - 9x + 12; all real numbers



B) -30x2 - 9x + 12; all real numbers except x = 4



C) -18x2 - 39x + 20; all real numbers



D) -18x2 - 39x + 20; all real numbers except x = 1

Answer 1

-30x^2-9x+12 all real numbers

Explanation:

f(x) = -6x + 3 and g(x) = 5x + 4

f(x) * g(x) = (-6x + 3) * ( 5x + 4)

FOIL

= -30x^2 -24x+15x +12

Combine like terms

=-30x^2-9x+12

The domain is what numbers x can take

There are no restrictions so all real numbers