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Q7   Evaluate the product ( 3\vec a - 5 \vec b ). ( 2 \vec a + 7 \vec b ).

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To evaluate the product ( 3\vec a - 5 \vec b ). ( 2 \vec a + 7 \vec b )

( 3\vec a - 5 \vec b ). ( 2 \vec a + 7 \vec b )=6\vec a.\vec a+21\vec a.\vec b-10\vec b.\vec a-35\vec b.\vec b

                                          =6\vec a.^2+11\vec a.\vec b-35\vec b^2

                                          =6\left | \vec a \right |^2+11\vec a.\vec b-35\left | \vec b \right |^2

Posted by

Pankaj Sanodiya

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