am82468
am82468 am82468
  • 25-06-2020
  • Mathematics
contestada

Solve the system y = 2x – 4 and y = (x – 1)² – 5

Respuesta :

osikbro
osikbro osikbro
  • 25-06-2020

Answer:

[tex]x=2\pm\sqrt{3}[/tex]

[tex]y=\pm 2\sqrt{3}[/tex]

Step-by-step explanation:

Since both equations are equal to y, you can set them equal to each other.

[tex]2x-4=(x-1)^2-5 \\\\\\2x-4=(x^2-2x+1)-4 \\\\\\2x-4=x^2-2x-3 \\\\\\x^2-4x+1=0 \\\\\\x=\dfrac{4\pm\sqrt{16-4}}{2}=\dfrac{4\pm2\sqrt{3}}{2}=2\pm\sqrt{3} \\\\\\y=2(2\pm\sqrt{3})-4=\pm 2\sqrt{3}[/tex]

Hope this helps!

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