Question

the vertex of a parabola is (-1.5, -12.5), and its y-intercept is (0, -8).the x-intercepts of the parabola are -2,0 -4,0 2,0 4,0 and -1,0 2,0 1,0 -2,0

Answer 1

Hello,

y=k(x+3/2)²-25/2
and -8=k*9/4-25/2==>9/4k=9/2==>k=9/2*4/9=2

y=2(x+3/2)²-25/2

x- intercepts:
y=0=2(x+3*2)²-25/2
==>(x+3/2)²=25/4
==>x=-3/2-5/2 or x=-3/2+5/2

==>x=-4 or x=1

(-4,0) and (1,0) are x intercepts

Answer no choice!