The vectors $5i + 8j$ and $2i + 7j$ are added. The magnitude of the sum of these vector is
The vectors $5i + 8j$ and $2i + 7j$ are added. The magnitude of the sum of these vector is
- A
$\sqrt {274} $
- B
$38$
- C
$238$
- D
$560$
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$(a)$ $\vec{a}+\vec{b}$
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$(a)$ $\vec{a}+\vec{b}$
$(b)$ $3 a_x+2 b_y$
$(c)$ $(\vec{a}+\vec{b}-\vec{c})$