Question

completing the square of -x^2 - 2x +3

Answer 1

I got -(x+1)^2-4 but apparently its +4

Answer 2

how did you get -4?

Answer 3

\(-(x^2 + 2x+1 -4 )
\\ = -([x+1]^2 - 4) \\ = -[x+1]^2 -(-4) \\ = -(x+1)^2 +4\)

Answer 4

(x + a)^2 = x^2 + 2a*x + a^2

notice the relationship from 2a and a^2, that is where you take half your middle coeffiecient 1/2*[2a] = a, then square it , a^2

Answer 5

-x^2 - 2x +3

-( x^2 + 2x ) - 3
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2a = 2 here