Simplify the expression. Please show your work (3i)(7i)
To simplify the expression (3i)(7i), we can use the property of multiplying imaginary numbers:
(i)^2 = -1
By substituting this value into our expression, we have:
(3i)(7i) = 3 * 7 * (i)^2
Now we can substitute (i)^2 with -1:
(3i)(7i) = 3 * 7 * (-1)
Multiplying the numbers, we get:
(3i)(7i) = -21