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.

222-9+11+12:2*14+14 = ? ( )

Toán Lớp 9: a) –x2 + 324 =0 b) 16×2 – 5 = 0 c) 2/√X-3 =4 d) √4x^2 -4x +1 =3

Toán Lớp 9: a) –x2 + 324 =0 b) 16×2 – 5 = 0
c) 2/√X-3 =4
d) √4x^2 -4x +1 =3

Comments ( 1 )

  1. a)-x^2+324=0
    <=>-x^2=-324
    <=>x^2=324
    <=>x=+-18
    b)16x^2-5=0
    <=>16x^2=5
    <=>x^2=5/16
    <=>x=(\sqrt{5})/4
    c)2/(\sqrt{x}-3)=4
    <=>\sqrt{x}-3=1/2
    <=>\sqrt{x}=1/2+3
    <=>x=(49)/4
    d)\sqrt{4x^2-4x+1}=3
    <=>4x^2-4x+1=9
    <=>4x^2-4x-8=0
    <=>4(x^2-x-2)=0
    <=>x^2-x-2=0
    <=>x^2+x-2x-2=0
    <=>x(x+1)-2(x+1)=0
    <=>(x+1)(x-2)=0
    <=>x=-1 hoặc x=2

Leave a reply

222-9+11+12:2*14+14 = ? ( )