Consequence from the properties of the scalar product. What does this follow from?

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MuffinLover32021-12-29 19:23:48

Mathematics

MuffinLover3, 2021-12-29 19:23:48

Consequence from the properties of the scalar product. What does this follow from?

Hello! I'm trying to figure out a simple consequence of scalar products.
But I'm confused and I can't figure out the proof .. Why can we take the first step ...

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Wataru, 2021-12-29
@wataru

This follows from two properties: the scalar product of a sum is the sum of scalar products; the constant factor can be taken out of brackets.

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