Question

Find the x-intercepts of the parabola with vertex (1, -9) and y intercept at (0, -6).


(-1, 0), (3, 0)


(-0.73, 0), (2.73, 0)

(-1.48, 0), (2.48, 0)



(-4.67, 0), (1.67, 0)

Answer 1

Hello,

Equation is y=k(x-1)²-9
and when x=0,y=-6==>-6=k*1²-9==>k=3

y=3(x-1)²-9
when y=0, 3(x-1)²-9=0
==>(x-1-√3)(x-1+√3)=0
x-intercepts are (1+√3,0) and (1-√3,0)

Answer B.