Question

Tìm x :

4x^3 + 12 = 120

Answer 1

4x³+12 = 120

<=> 4x³= 108

<=> x³= 27

<=> x³=3³

<=> x = 3 (t/m)

Answer 2

\(4\cdot x^3+12=120\)

\(4\cdot x^3=120-12\)

\(4\cdot x^3=108\)

\(x^3=108:4\)

\(x^3=27\)

\(x=\sqrt[3]{27}=3\)

Vậy \(x=3\)