Find $| \mathbf { a } |$ , a + B $\mathbf { a } - \mathbf { b }$

question 117

Essay

Find $| \mathbf { a } |$ , a + b, $\mathbf { a } - \mathbf { b }$ , 2a, and 3a + 4b given $\mathbf { a } = ( 3,2 , - 1 )$ and $\mathrm { b } = \langle 0,6,7 \rangle$ .