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If u = 2i - j; v= -5i + 4j and w = j find 4u (v -w).
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If u = 2i - j; v= -5i + 4j and w = j find 4u (v -w).

User Tim Richardson
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1 Answer

3 votes

Answer:

-40

Step-by-step explanation:

Given

u = 2i - j; v= -5i + 4j and w = j

Required

4u(v-w)

4u = 4(2i) = 8i

v - w = -5i + 4j - j

v - w = -5i + 3j

Substitute

4u(v-w)

= 8i(-5i+3j)

= -40(i*i) [since i*i = 1]

= -40

Hence the required solution is -40

User Chris Houghton
by
3.6k points
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