Toán Lớp 8: x^2-2x-8=0
Helpaaaaaaaaaaaaaaaaaaaaaaa
Leave a reply
Register Now
Login
Lost Password
Lost your password? Please enter your email address. You will receive a link and will create a new password via email.
Toán Lớp 8: x^2-2x-8=0
Helpaaaaaaaaaaaaaaaaaaaaaaa
Comments ( 2 )
$⇔x^2+2x-4x-8=0$
$⇔x(x+2)-4(x+2)=0$
$⇔(x+2)(x-4)=0$
$+,x+2=0$
$⇔x=-2$
$+,x-4=0$
$⇔x=4$
Vậy S={-2;4}