Answer: y = -2x^2 - 2x + 40
Step-by-step explanation:
First we can distribute the -2 onto x and 5 which leaves us with
y = (-2x - 10)(x - 4)
Then we use FOIL to multiply (-2x-10) and (x-4)
-2x * x = -2x^2
-2x * -4 = 8x
-10 * x = -10x
-10 * -4 = 40
That leaves us with y = -2x^2 + 8x -10x + 40
Combining like terms gives us y = -2x^2 - 2x +40
If you are unfamiliar with FOIL please look up a video.
