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3 votes
Find the x-intercepts of the parabola with

vertex (4,-20) and y-intercept (0,-4).
Write your answer in this form: (x1,71), (X2,72).
If necessary, round to the nearest hundredth.

User Quantium
by
4.0k points

1 Answer

2 votes

Answer:

(8.47,0) (-0.47,0)

Explanation:

y = a(x - h)² + k

y = a(x - 4)² - 20

-4 = a(0 - 4)² - 20

16 = 16a

a = 1

y = (x - 4)² - 20

x-intercepts: y = 0

(x - 4)² = 20

x - 4 = +/- 4.47..

x = 4.47+4, -4.47+4

x = 8.47, -0.47

User Radford Parker
by
4.0k points