Question

Find the equation of the axis of symmetry and the coordinates of the vertex of the graph of the function y = 4x2 – 8x – 3.

A.x = 1; vertex: (1, – 7)
B.x = 1; vertex: (1, – 11)
C.x = –1; vertex: (–1, 9)
D.x = –1; vertex: (–1, – 7)

Answer 1

(1,-7)

Explanation:

i dont know how do it i just geussed and got it right

Answer 2

axis of symmerty from form
ax²+bx+c is -b/2a
the axis of symetry is the x value of the vertex so just put the axis of symetry for x an evaluate


4x²-8x-3
-b/2a=-(-8)/(2*4)=8/8=1

input for x
4(1)²-8(1)-3=4-8-3=-7

(1,-7) is vertex

A is answer