Question

Let f(x) = x – 3 and g(x) = x + 11. Find f(x) • g(x).

x2 – 8x – 33

x2 – 8x + 14

x2 + 8x + 14

x2 + 8x – 33

Answer 1

\[f(x) \cdot g(x)=(x-3)(x+11)\]
Just expand and simplify

Answer 2

so it would be x2-8x+14 where does the 8x come from?

Answer 3

Nope.
-3(11) is not 14

Answer 4

Also 11x-3x is not -8x

Answer 5

\[(x-3)(x+11)=x(x+11)-3(x+11)=x \cdot x + x \cdot 11 -3 \cdot x -3 \cdot 11\]

Answer 6

f(x).g(x)= (x-3)(x+11)
=x(x+11)-3(x+11)
=x2+11x-3x-33
=x2+8x-33

Answer 7

awesome thanks i understand