Please answer my question below!

Question

The quadratic function y= 0.16x^2 + 2x- 1 cannot be factored.

Answer to the nearest hundredth, where necessary.

a) Find the x-intercepts.

b) Find the y-intercept.

c) Fine the coordinates of the vertex.

d) Find the equation of the axis of symmetry.

Answer 1

y = .16x^2 + 2x -1

x= -2/-.16 + or - (1/.16)sqr(4 +4(.16) = -6.25 + or - 6.73 = -12.98 or 0.48 = x intercepts

or the points (-12.98,0) and (0.48,0)

axis of symmetry is x = -6.25

y intercept = -1 or the point (0,-1)

vertex is (-6.25, - 7.25)

y=.16(x^2 + 12.5x ) - 1 - 6.25

y = .16(x+6.25) - 7.25

vertex is (-6.25, - 7.25)