paulasmrek
paulasmrek paulasmrek
  • 07-12-2016
  • Mathematics
contestada

Find the x-intercepts of the parabola with vertex (-3,-18) and y-intercept at (0,0)

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Wahl421
Wahl421 Wahl421
  • 07-12-2016
y + 18 = a(x + 3)^2 
0 + 18 = a(0 + 3)^2 
18 = 9a 
2 = a 

y = 2(x + 3)^2 - 18 
0 = 2(x + 3)^2 - 18 
18 = 2(x + 3)^2 
9 = (x + 3)^2 
± 3 = x + 3 
-3 ± 3 = x 
x = 0 or -6 

(0, 0) and (-6, 0)
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