finding coordinate vector with basis

[patent coral]

help pls

[torpid wren]

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[patent coral]

i wrote the correct answers for each box but i have no idea how to get them

[median orchid]

Write u in the basis B

Then just extract the coefficients

[patent coral]

are you able to write that out

i dont understand

i know you have to do this

but if you're saying to extract the coefficients for this point then -7, 17, 11 are wrong

[patent coral]

i got it

+close