sk5 sk5
  • 13-05-2019
  • Mathematics
contestada

Solve by factoring: x^2- 8x- 20 =0

Respuesta :

gmany
gmany gmany
  • 13-05-2019

Answer:

x = -2 or x = 10

Step-by-step explanation:

[tex]x^2-8x-20=0\\\\x^2+2x-10x-20=0\\\\x(x+2)-10(x+2)=0\\\\(x+2)(x-10)=0\iff x+2=0\ \vee\ x-10=0\\\\x+2=0\qquad\text{subtract 2 from both sides}\\\boxed{x=-2}\\\\x-10=0\qquad\text{add 10 to both sides}\\\boxed{x=10}[/tex]

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