(4-2i)(5+3i)
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20-10i+12i-6i^2
20 +2i -6(-1)
26+2i
20 +2i -6(-1)
26+2i
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(4-2i)(5+3i)
First you have to distribute
4*5 4*3i
-2i*5 -2i*3i
20+12i+-10i+-6i^2
reduce
20+2i+6i^2
You have to list it in order of the x's/list them starting with the highest power of x
6i^2+2i+20
PS: the ^2 is a square sign
PSS: a little trick is called FOIL
First
Outside
Inside
Last
Hope this helps
Oh and PSSS: what grade r u in? Not to sound stockerish, but we r just learning this and i am in 6th grade....
First you have to distribute
4*5 4*3i
-2i*5 -2i*3i
20+12i+-10i+-6i^2
reduce
20+2i+6i^2
You have to list it in order of the x's/list them starting with the highest power of x
6i^2+2i+20
PS: the ^2 is a square sign
PSS: a little trick is called FOIL
First
Outside
Inside
Last
Hope this helps
Oh and PSSS: what grade r u in? Not to sound stockerish, but we r just learning this and i am in 6th grade....
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Use FOIL
4*5 + 4*3i - 2i*5 - 2i*3i
= 20 + 12i - 10i - 6(-1) = 26 + 2i
ProfRay
4*5 + 4*3i - 2i*5 - 2i*3i
= 20 + 12i - 10i - 6(-1) = 26 + 2i
ProfRay
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(4-2i)(5+3i)
(2i)(8i)
(16i)
That should be it unless you're solving for i, but sorry. I'm too lazy to figure out your homework.
(2i)(8i)
(16i)
That should be it unless you're solving for i, but sorry. I'm too lazy to figure out your homework.
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just factor:
20 - 10i + 12i - 6 i^2 = 20 + 2i + 6 = 26 + 2i
20 - 10i + 12i - 6 i^2 = 20 + 2i + 6 = 26 + 2i