

MCQOPTIONS
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1. |
Let \(\left| {\overrightarrow {{{\rm{A}}_1}} } \right| = 3,\;\left| {\overrightarrow {{{\rm{A}}_2}} } \right| = 5{\rm{\;and\;}}\left| {\overrightarrow {{{\rm{A}}_1}} + \overrightarrow {{{\rm{A}}_2}} } \right| = 5\). The value of \(\left( {2\overrightarrow {{{\rm{A}}_1}} + 3\overrightarrow {{{\rm{A}}_2}} } \right) \cdot \left( {3\overrightarrow {{{\rm{A}}_1}} - 2\overrightarrow {{{\rm{A}}_2}} } \right)\) is: |
A. | -106.5 |
B. | -99.5 |
C. | -118.5 |
D. | -112.5 |
Answer» D. -112.5 | |