What is the vertex of the graph of y = x² + 4x? (-2, -12) (-2,-8) (-2,-6) (-2,-4)

(-2,-4)

Step-by-step explanation:

in this exercise I have the formula of the parable expressed as:

I can write it in its "vertex form"

being (d,e) the coordinates of the vertex of said parabola.

by clearing the equation I can see that so I substitute

Now taking d as the value for the x axis of the vertex coordinate, I substitute d in x, in the initial equation

So finally, I have the coordinates of the vertex of the parabola are (-2,-4)

Done

= 5

step-by-step explanation:

to find the 15th term substitute n = 15 into the nth term formula

= (- 3 × 15 ) + 50 = - 45 + 50 = 5