document.write( "Question 1206885: Find the indicated quantity, assuming that \r
\n" ); document.write( "\n" ); document.write( "u = 5i + j, v = i − 3j, and w = 3i + 7j.\r
\n" ); document.write( "\n" ); document.write( "u · (v + w) \n" ); document.write( "

Algebra.Com's Answer #844580 by MathLover1(20850) $\"\"$ $\"About$

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\n" ); document.write( " $\"u+=+5i+%2B+j\"$
\n" ); document.write( " $\"v+=+i+-+3j\"$
\n" ); document.write( " $\"w+=+3i+%2B+7j\"$ \r
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\n" ); document.write( "\n" ); document.write( " $\"u%2A%28v%2Bw%29\"$ \r
\n" ); document.write( "\n" ); document.write( "first find $\"v%2Bw=i-3j%2B3i%2B7j=4i%2B4j\"$ \r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( " $\"u%2A%28v%2Bw%29=%285i+%2B+j%29%2A%284i%2B4j%29\"$ \r
\n" ); document.write( "\n" ); document.write( " $\"u%2A%28v%2Bw%29=5i%2A4i%2B5i%2A4j%2Bj%2A4i%2Bj%2A4j\"$ \r
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\n" ); document.write( "\n" ); document.write( "since $\"i%2Ai+=+1\"$ , $\"j%2Aj+=1\"$ , $\"i%2Aj+=+0\"$ , $\"+j%2Ai+=0\"$ , we have\r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( " $\"u%2A%28v%2Bw%29=5%2A4%2A1%2B5%2A4%2A0%2B0%2A4%2B1%2A4\"$ \r
\n" ); document.write( "\n" ); document.write( " $\"u%2A%28v%2Bw%29=24\"$ \r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( " \n" ); document.write( "

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