Question

simplify the expression (-6i)(-4i)

Answer 1

Notice that we simply have 4 things being multiplied together, -6, i, -4, and i.

Multiplication is `commutative`,
so we can rearrange the order in which we multiply.
Let's bring the i's to the back, and combine the numbers first.\[\large\rm (-6)(-4)i\cdot i\]

Answer 2

24i^2 ???

Answer 3

So what do you get for the number in front? :)

Answer 4

is it 24i^2?

Answer 5

@Michele_Laino

Answer 6

we can write this:
\[\large \left( { - 6i} \right) \cdot \left( { - 4i} \right) = \left( { - 6} \right) \cdot \left( { - 4} \right) \cdot i \cdot i = 24 \cdot {i^2} = 24 \cdot \left( { - 1} \right) = ...?\]

Answer 7

is it 24i^2?

Answer 8

yes!