Write the answer in standard form.
2007-08-30 12:01:22 · 7 answers · asked by bealsey1 2 in Science & Mathematics ➔ Mathematics
49 - 16 i ²
49 + 16
65
6.5 x 10
2007-09-03 11:07:18 · answer #1 · answered by Como 7 · 0⤊ 0⤋
7(7+4i)-4(7+4i)=49+28i-28-16i.(take like terms)49-28+28i-16i=21+12i.21+12i=0. 21=0-12i.-12i=21 .i=21dividedby 12=1.75.=17.5x10 raised to power 1
2007-08-30 19:26:46 · answer #2 · answered by tinux 1 · 0⤊ 0⤋
(7-4i)(7+4i)
= 49-16i^2
= 65
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Ideas to save time: Use (a-b)(a+b) = a^2-b^2
2007-08-30 19:10:30 · answer #3 · answered by sahsjing 7 · 0⤊ 0⤋
(7-4i)(7+4i)
49 +24i -24i -16i^2
49 - 16i^2
i = sqroot(-1)
i^2 = sqroot(-1)*sqroot(-1) = -1
49 - 16(-1)
49 + 16
65
2007-08-30 19:10:05 · answer #4 · answered by roOt 3 · 0⤊ 0⤋
(49 -16(-1))
49 +16 = 65
2007-08-30 19:09:52 · answer #5 · answered by ninesunz 3 · 0⤊ 0⤋
if you mean "i" as in complex --
the answer is
28-28i+28i-16i^2
28-16(-1) since i^2 =-1
28+16= 44
2007-08-30 19:09:33 · answer #6 · answered by jon d 3 · 0⤊ 1⤋
not a clue
2007-08-30 19:15:16 · answer #7 · answered by cartercarlisa 2 · 0⤊ 0⤋