Toán câu phương trình vô tỉ với

F

fanyfanytiffany

Last edited by a moderator:
D

dien0709

$2x^2+x+\sqrt{x^2+3}+2x\sqrt{x^2+3}=9$

$\iff x^2+3+2x\sqrt{x^2+3}+x^2+x+\sqrt{x^2+3}-12=0$

$\iff (x+\sqrt{x^2+3})^2+ (x+\sqrt{x^2+3})-12=0$

$\iff x+\sqrt{x^2+3}=3$ hoặc $=-4$
 
You must log in or register to reply here.
Top Bottom