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katrin2010 [14]
3 years ago
8

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

Mathematics
1 answer:
Sergio [31]3 years ago
3 0
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.

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