Answer:
F(x) = -6x + 20
Step-by-step explanation:
F(x) = x2 - 8x +20
As you can see, they just put it as x2 and x2 is the same as 2x so we got:
F(x) = 2x - 8x + 20
F(x) = -6x + 20
But if you mean x^2 -8x +20 so, we know that a^2 -2ab + b^2 = (a-b)^2
So in this case, it would be:
= x^2 - 8x + (1/2*8)^2 +20-(1/2*8)^2
= (x^2 - 8x + 4^2) +20 - 16
= (x-4)^2 + 4
= (x-4)^2 + 2^2
we know that a^2 + b^2 = (a+b) * (a-b) so:
= (x-4+2) * (x-4-2)
= (x-2)*(x-6)
Hope this help you :3
