Determine the vertex form of g(x) = x2 + 2x – 1. which graph represents g(x)?

g(x) = x² + 2x - 1

Since its a parabola we have the formula to the vertex

(Xv, Yv) = (-b/2a, -Δ/4a)

(Xv, Yv) = (-2/2.1, -(2² -4.1.(-1))/4.1)

(Xv, Yv) = (-1, -2)

the answer is D

Step-by-step explanation:

just got it right on E2020

answer:

(-8,7)

explanation:

we know that  

f

(

−

3

)

=

7

therefore, if we wish to get the output as 7, in the function, we need to have our input to be -3.

looking at the function  

f

(

x

+

5

)

, what should the value of x be, such that the input in the function becomes 7?

we simply equate the terms,

x

+

5

=

−

3

x

=

−

8

thus, the point on the new function would be  

(

−

8

,

7

)

a. the residual plot for model 1 has a random pattern and is a good fit for the data.