Question

giải phương trình sau:

\(\left(x+2\right)^4+\left(x+8\right)^4=272\)

Answer 1

x^4*4x^3*2+6x^2*2^2+4x*2^3+2^4+x^4+4x^3*8+6x^2*8^2+4x*8^3+8^4=272

2x^4+40x^3+408x^2+2080x+4112=272

Đến đây là bt ra x = -4

Answer 2

x = -4 nha 

Answer 3

\(\left(x+2\right)^4+\left(x+2\right)^4=272\)

\(\Rightarrow2\left[\left(x+2\right)^4\right]=272\)

\(\Rightarrow\left(x+2\right)^4=136\)

Vậy...............

Answer 4

-4 nha bn

Answer 5

(x+2)4+(x+2)4=272

⇒2[(x+2)4]=272

⇒(x+2)4=136

Vậy...............