ayoismeisalex
24.06.2020 •
Mathematics
Can someone help me with this please
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Ответ:
9 over 4= 2 and 1 quarter. 16+2 over 8= 2 and 2 eighths and 2 eighths are equivalent to 1 quarter. Hope this helped :)
Ответ:
We must set up this equation to find a * b.
We know:
a = 7i - 4j
b = 4i + 3j
(7i - 4j)(4i + 3j)
Let's use FOIL
First
Outside
Inside
Last
First: 7i * 4i
Outside: 7i * 3j
Inside: -4j * 4i
Last: -4j * 3j
7i * 4i = 28i^2
7i * 3j = 21ij
-4j * 4i = -16ij
-4j * 3j = -12j^2
28i^2 + 21ij - 16ij - 12j^2
Now we must simplify
21ij - 16ij =5ij
28i^2 - 12j^2 + 5ij
Your answer is 28i^2 - 12j^2 + 5ij
I hope my answer helped you!
~ Fire