Answer urgent please!!

1 answer:

4 0

Answer:

Step-by-step explanation:

$u=5i-j\\\\v=3i+j\\\\w=i+4j\\$

$v+w$

$3i+j+i+4j\\\\4i+5j\\\\u*(v+w)\\\\(5i-j)(4i+5j)\\\\20-5\\\\\boxed{15}$

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