(-2i²)
2007-09-28 09:42:21 · 4 answers · asked by caly c 1 in Science & Mathematics ➔ Mathematics
Always remember that i squared equals negative 1. So, square the -2 and get 4. Square the i and get -1. Multiply them and you get -4. To put this in a+bi form, use 0 for b:
-4 + 0i
that's it.
2007-09-28 09:47:29 · answer #1 · answered by Marley K 7 · 0⤊ 1⤋
Hi,
There expression as written is equivalent to this:
(-2)(i)²
= (-2)(-1)
= 2
Converting to rectangular:
2 + 0i
If the expression were:
(-2i)²
Then the expression would be equivalent to this:
(-2)²(i)²
=(4)(-1)
=-4
or in rectangular:
-4 +0i
FE
2007-09-28 16:59:15 · answer #2 · answered by formeng 6 · 0⤊ 0⤋
i^2 = -1
therefore, -2*-1 = 2
2+0i
2007-09-28 16:47:26 · answer #3 · answered by Aero_B 1 · 1⤊ 0⤋
(-2i^2)=(-2x-1)=2
=2+0i ans
2007-09-28 16:54:44 · answer #4 · answered by MAHAANIM07 4 · 0⤊ 0⤋