Solve the problem.
-If $\mathbf { u } = 7 \mathbf { i } - 4 \mathbf { j }$ and $\mathbf { v } = - 2 \mathbf { i } + 9 \mathbf { j }$, find $\mathbf { u } + \mathbf { v }$.
A) $- 9 i + 5 j$
B) $5 \mathbf { i } + 5 \mathbf { j }$
C) $9 \mathbf { i } + 4 \mathbf { j }$
D) $4 i + 5 j$

Question

Quizplus · Accepted Answer

To find $\mathbf { u } + \mathbf { v }$, add the corresponding components: $7\mathbf { i } + (-2\mathbf { i }) = 5\mathbf { i }$ and $(-4\mathbf { j }) + 9\mathbf { j } = 5\mathbf { j }$, resulting in $5\mathbf { i } + 5\mathbf { j }$.

Solve the Problem u=7i−4j\mathbf { u } = 7 \mathbf { i } - 4 \mathbf { j }u=7i−4j

Solve the Problem $\mathbf { u } = 7 \mathbf { i } - 4 \mathbf { j }$