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C

Step-by-step explanation:

You can confirm this by expanding this:

Therefore, the answer is choice C. Hope this helps!

C

Step-by-step explanation:

x^2-2x-80

(x^2+8)+(-10x-80)

factor out the -10 for -10x-80

=x(x+8)-10(x+8)

(x+8)(x-10)

pls mark me brainliest

radius=5, centre=(-1,-2)

Step-by-step explanation:

You need to complete the square for both x and y.

breaking the equation up we find that: in completed square form = which simplifies to . Remember that you complete the square by halving the "b" value and then squaring it. 2/2 squared=1. Also, the one that you add to complete the square must be added to the other side of the equation to get 20+1.

Now onto the y value in completed square form =. The 4 that you add to get it into the quadratic form must be added on other side of the equal sign to get 20+1+4.

the final equation is