It's 8 sqrt(2) at an angle of 135° .
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8 - 8i
8i and -8i both satisfy this: (8i)² = (8²)(i²) = (64)(-1) = -64, and (-8i)² = (-8²)(i²) = (64)(-1) = -64
x2 - 2x + 65 = 0 Subtract 64 from each side: x2 - 2x + 1 = -64 (x - 1)2 = (i*8)2 where i is the imaginary square root of -1 x - 1 = +/- 8i x = 1 +/- 8i
(2i)3 = 8i3 = 8(i2)(i) = 8(-1)(i) = -8i
80000000 plus 4000000 plus 100 plus 8 in standard form = 84,000,108