giai giup minh phuong trinh nay voi?

N

nguyenbahiep1

bình phương 2 vế ta có

[laTEX]2x+2\sqrt{x^2-x-11} = 16 \\ \\ \sqrt{x^2-x-11} = 8-x \\ \\ dk: x \leq 8 \\ \\ x^2-x-11 = x^2-16x+64 \\ \\ \Rightarrow x = 5[/laTEX]
 
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