4. (a) Let {b,, b2, b3, bą} be an orthonormal basis for a three-dimensional subspace of Rº, and let u= b, - 2b2 + b3 – 2bą and v= b; + b2 – b3 – bạ. Then = u'v = _? Show your work. (b) What is the length of u + v? Show your work.

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