misiame101
misiame101 misiame101
  • 21-08-2018
  • Mathematics
contestada

ASAP WILL MARK BRAINLYEST


answer these two please!

ASAP WILL MARK BRAINLYEST answer these two please class=

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gmany
gmany gmany
  • 30-08-2018

[tex]19.\\y=3x^2\\a=3,\ b=0,\ c=0\\\\\dfrac{-b}{2a}=\dfrac{-0}{2(3)=0\to x=0\\\\3x^2=0\ \ \ \ |:3\\\\x^2=0\to x=0[/tex]

[tex]20.\\y=x^2-x-2\\a=1,\ b=-1,\ c=-2\\\\\dfrac{-b}{2a}=\dfrac{-(-1)}{2(1)}=\dfrac{1}{2}\to x=\dfrac{1}{2}\\\\x^2-x-2=0\\\\x^2-2x+x-2=0\\\\x(x-2)+1(x-2)=0\\\\(x-2)(x+1)=0\iff x-2=0\ \vee\ x+1=0\\\\x=2\ \vee\ x=-1[/tex]

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