Basic Math Examples

$(- 5 i) (4 i)$

Step 1

Multiply $(- 5 i) (4 i)$ .

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Step 1.1

Multiply $4$ by $- 5$ .

$- 20 i i$

Step 1.2

Raise $i$ to the power of $1$ .

$- 20 (i^{1} i)$

Step 1.3

Raise $i$ to the power of $1$ .

$- 20 (i^{1} i^{1})$

Step 1.4

Use the power rule $a^{m} a^{n} = a^{m + n}$ to combine exponents.

$- 20 i^{1 + 1}$

Step 1.5

Add $1$ and $1$ .

$- 20 i^{2}$

Step 2

Rewrite $i^{2}$ as $- 1$ .

$- 20 \cdot - 1$

Step 3

Multiply $- 20$ by $- 1$ .

$20$