Multiply. \[ \frac{1}{2} x^{2}\left(8 x^{2}-4 x+1\right) \] \( \frac{1}{2} x^{2}\left(8 x^{2}-4 x+1\right)=\square \) (Simplify your answer. Use integers or fractions for any numbers in the expression.)

\( 1 \leftarrow \underbrace{(5 x-3)^{2}=\square \text { (Simplify your answer.) }}_{(5 x-3)^{2}} \)

Multiply. \( (3 x+2)\left(x^{3}-2 x^{2}+x-1\right) \) \( (3 x+2)\left(x^{3}-2 x^{2}+x-1\right)=\square \) (Simplify your answer.)

\( \leftarrow \quad \begin{array}{l}\text { Multiply. } \\ \qquad(9 a+7 b)^{2}\end{array} \)

\[ \text { Use the formula for a binomial squared to multiply. } \] \[ (3 x+2)^{2} \] \( (3 x+2)^{2}=\square_{\text {(Simplify your answer.) }} \)

Solve the equation. All numbers are approximate. \( 6.2-0.2(x-7.0)=0.6 x \) \( x=\square \) (Type an integer or a decimal.)