Determine the vertex of
f(x) = x^2 + 8x - 5

(-4,-21)

Step-by-step explanation:

Apply the formula for calculate the x-coordinate of the vertex of the parabola:

Where:

a=1 and b=8

Then, this is:

Now you must substitute x=-4 into the function to obtain the y-coordinate of the vertex.

Then, this is:

Therefore the vertex is:

(-4,-21)

10 cm

step-by-step explanation:

if the polygon is a rectangle, then the perimeter is x+x+y+y. using the values that you gave, the perimeter is 3+3+2+2=10cm.