Which expression is equal to real number?a) (-4i)^11.b) (4+5i) (4-5i)c) (2+3i)^2.d) (6+8i) (8+6i)
Akshith reddy , 7 Years ago
Grade 9
Algebra> Which expression is equal to real number?...
1 Answers
Arun
Last Activity: 7 Years ago
(-4 i)11 = 411 i11 = -411 i = imaginary
(4+5i)(4-5i) = 42 - 52 i2 = 16+25 = 41 = real number
(2+3i)2 = -5 + 12i = complex number with imaginary part
(6+8i)(8+6i)= 48 - 48 + 100i = 100 i = imaginary
hence optuon 'b' is equal to real number.
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