Let f(x) = x2 + 3x - 4 and g(x) = x + 5. Find f(x) · g(x).

x3 + 3x2 + 16x - 20

x3 + 5x2 + 14x - 20

x3 + 8x2 + 11x - 20

x3 + 9x2 + 19x - 20

Question

Let f(x) = x2 + 3x - 4 and g(x) = x + 5. Find f(x) · g(x).

 x3 + 3x2 + 16x - 20

 x3 + 5x2 + 14x - 20

 x3 + 8x2 + 11x - 20

 x3 + 9x2 + 19x - 20

anonymous · Answer

could you use FOIL on this?

anonymous · Answer

also x2 is x^2

anonymous · Answer

ok so if f= x^2+3x-4 and g=x+5 and we need to find f*g we must set it up like :|dw:1382019195967:dw|

anonymous · Answer

do you know where to go from here?

anonymous · Answer

I'm lost lol

anonymous · Answer

I see it

anonymous · Answer

You ever heard of a punnet square? Well that is what it is, You'll get the same answer as you would using foil, but I understand this way better so I used it like this. DO you understand how to see foil then?

anonymous · Answer

Yeah I see FOIL now

anonymous · Answer

so now do we combine like terms?

anonymous · Answer

yes, :) and you'll see your answer up there