Solve for: номер

Expression: $$\left. \begin{array} { l } { \quad - 3 i \cdot 6 i - 3 ( - 7 + 6 i ) } \end{array} \right.$$

Multiply $-3i$ and $6i$ to get $18$.

$$18-3\left(-7+6i\right)$$

Multiply $3$ times $-7+6i$.

$$18-\left(3\left(-7\right)+3\times \left(6i\right)\right)$$

Do the multiplications in $3\left(-7\right)+3\times \left(6i\right)$.

$$18-\left(-21+18i\right)$$

Subtract $-21+18i$ from $18$ by subtracting corresponding real and imaginary parts.

$$18-\left(-21\right)+18i$$

Subtract $-21$ from $18$.

$$39-18i$$