If \(\left| {\overrightarrow a } \right| = 5\), \(\left| {\overrightarrow a - \overrightarrow b } \right| = 8\) and \(\left| {\overrightarrow a + \overrightarrow b } \right| = 10\), then the value of \(\left| {\overrightarrow b } \right|\) is:

If \(\left| {\overrightarrow a } \right| = 5\), \(\left| {\overright

1.	If \(\left\| {\overrightarrow a } \right\| = 5\), \(\left\| {\overrightarrow a - \overrightarrow b } \right\| = 8\) and \(\left\| {\overrightarrow a + \overrightarrow b } \right\| = 10\), then the value of \(\left\| {\overrightarrow b } \right\|\) is:
A.	1
B.	√57
C.	3
D.	√42
Answer» C. 3

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If \(\left| {\overrightarrow a } \right| = 5\), \(\left| {\overrightarrow a - \overrightarrow b } \right| = 8\) and \(\left| {\overrightarrow a + \overrightarrow b } \right| = 10\), then the value of \(\left| {\overrightarrow b } \right|\) is:

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