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Kruka [31]
2 years ago
7

PLZ ANSWER ASAP

Mathematics
2 answers:
Nutka1998 [239]2 years ago
3 0

Answer:

C.)-18\sqrt{7} Is your answer!

Step-by-step explanation:

Please mark brainliest if this helped! :D

lisabon 2012 [21]2 years ago
3 0
The answer is A.) -90
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Find a ⋅ b. a = 4i - 4j, b = 4i + 5j
svetoff [14.1K]

Answer:

value of a.b = -4

Step-by-step explanation:

We need to find a.b

a= 4i-4j

b = 4i+5j

We know that i.i =1, j.j=1, i.j =0 and j.i=0

a.b = (4i-4j).(4i+5j)

a.b = 4i(4i+5j)-4j(4i+5j)

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a.b = 16 +0-0-20

a.b = 16-20

a.b =-4

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7 0
3 years ago
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Step-by-step explanation:

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