annanguyen360 annanguyen360

02-08-2020
Mathematics

contestada

Find the zeros of y = x2 - 8x - 3 by completing the square.
O A. x=3+√7
B. X = +3
C. X = 4 + 119
O D. X= -4 + 119

Respuesta :

CSMedrano CSMedrano

02-08-2020

Answer:

Assuming that you meant 4+√19 is C.

Step-by-step explanation:

[tex]x^2-8x-3=x^2-2(4)x-3=x^2-2(4)x+16-3-16\\(x-4)^2-19\\(x-4)^2-19=0\\(x+4)^2=19\\x+4=\sqrt{19} \\x=-4+-\sqrt{19}[/tex]

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camrynleaks61 camrynleaks61

17-09-2020

B. X=+3 by completing the square

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