If you remember that the square of i is –1, you can reduce these to purely real numbers before you even FOIL.
![image](https://i0.wp.com/78.media.tumblr.com/cbba3d9dd4e3a75daebd080141d92ac9/tumblr_inline_pcf4x3mHB41qio24w_540.png?w=852&ssl=1)
In a + bi form, 5 is just 5 + 0i, so a + b will be 5 + 0 = 5.
from Tumblr https://ift.tt/2A7wbcj
If you remember that the square of i is –1, you can reduce these to purely real numbers before you even FOIL.
In a + bi form, 5 is just 5 + 0i, so a + b will be 5 + 0 = 5.
from Tumblr https://ift.tt/2A7wbcj