Question

[No Name]

TÌm x
5xⁿ⁺² - 3xⁿ +2xⁿ⁺² -4xⁿ + x^{n+2 - x}n =0

Answer 1

[Tuấn Anh Nguyễn Trần]

<=>5xⁿ.x²-3xⁿ+2xⁿ.x²-4xⁿ+xⁿ.x²-xⁿ=0

<=>(5xⁿ.x²+2xⁿ.x²)-(3xⁿ+4xⁿ)+(xⁿ.x²-xⁿ)=0

<=>7xⁿ.x²-7xⁿ+xⁿ(x²-1)=0

<=>7xⁿ(x²-1)+xⁿ(x²-1)=0

<=>8xⁿ(x²-1)=0<=>x²-1=0<=>x=-1 hoặc x=1