Question

[ᴾᴿᴼツHoàng Trọng Huy②⁰②¹ϡ]

(x+3)³ - 1= 31 x 2²                   

Giải chi tiết hộ mik nhé

Answer 1

[ミ★Zero ❄ ( Hoàng Nhật )]

\(\left(x+3\right)^3-1=31.2^2\)

\(\Leftrightarrow\left(x+3\right)^3-1=31.4\)

\(\Leftrightarrow\left(x+3\right)^3-1=124\)

\(\Leftrightarrow\left(x+3\right)^3=124+1=125\)

\(\Leftrightarrow\left(x+3\right)^3=5^3\)

\(\Rightarrow x+3=5\)

\(\Rightarrow x=5-3=2\)

Answer 2

[ILoveMath]

\(\left(x+3\right)^3-1=31.2^2\\ \Rightarrow\left(x+3\right)^3-1=124\\ \Rightarrow\left(x+3\right)^3=125\\ \Rightarrow\left(x+3\right)^3=5^3\\ \Rightarrow x+3=5\\ \Rightarrow x=2\)