2 years ago

Find the dot product, a • b. a = 6i + 5j, b = -5i + 4j

Mathematics

2 answers:

zysi [14]2 years ago

4 0

If i is a normal variable: then it is -30i^2 - i*j + 20j^2

If i is the constant i, then it is 20j^2 -i*j + 30

Readme [11.4K]2 years ago

4 0

Answer:

the answer is -10

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subtitute

$|AB|=\sqrt{(1-11)^2+(6-(-4))^2}=\sqrt{(-10)^2+10^2}=\sqrt{100+100}\\\\=\sqrt{100\cdot2}=\sqrt{100}\cdot\sqrt2=10\sqrt2\approx14.1$

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