Question

4 nhân ( 3x mũ 3 + 1mũ 10)= 4 nhân 5 mũ 2

Answer 1

\(4\left(3x^3+1^{10}\right)=4\cdot5^2\)

=>\(4\left(3x^3+1\right)=4\cdot25=100\)

=>\(3x^3+1=25\)

=>\(3x^3=24\)

=>\(x^3=8\)

=>\(x=\sqrt[3]{8}=2\)

Answer 2

\(4\cdot\left(3x^3+1^{10}\right)=4\cdot5^2\)

\(\Rightarrow3x^3+1=\dfrac{4\cdot5^2}{4}\)

\(\Rightarrow3x^3+1=5^2\)

\(\Rightarrow3x^3=25-1\)

\(\Rightarrow3x^3=24\)

\(\Rightarrow x^3=\dfrac{24}{3}\)

\(\Rightarrow x^3=8\)

\(\Rightarrow x^3=2^3\)

\(\Rightarrow x=2\)