Question

help me please



2. Where is the vertex of the parabola?

y = x2 + 2x – 3


Above the x-axis
Below the x-axis
On the x-axis
On the y-axis

Answer 1

no habla engles

Answer 2

I didn't learn that yet, ;( sorry

Answer 3

que nina's

Answer 4

su ok

Answer 5

esta bien @SexyDestiny1

Answer 6

ok lo siento

Answer 7

el nina mensaje que me @DJ3strella

Answer 8

y = x2 + 2x – 3

if we 'complete the square' we can pull out the coordinates for the vertex.

step 1, take the coefficeint of the x term out,
2

step 2, half it
2/2 = 1

step 3, square it
1^2 = 1

step 4, add 1 and subtract one to the equation
y = x2 + 2x – 3
y = x2 + 2x +1 – 3 -1

step 5, group the terms
y = x2 + 2x +1 – 3 -1
y = (x2 + 2x +1) – 3 -1

step 6, simpify
y= (x+1)^2 -4

step 7, extract coordiantes of vetex (h, k)
y= (x+1)^2 -4
y = a(x-h)^2 - k

can you see which values are 'h' and 'k'?

Answer 9

no @DemolisionWolf

Answer 10

thats ok!
there are a lot of steps in this, what parts don't make sense in 'completing the square'?