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Diketahui a → = ( t , 2 t + 1 , − t 3 ​ ) . Jika m ∠ ( a , b ) = 6 0 ∘ dan panjang proyeksi orthogonal a pada b yaitu 2 1 ​ 5 ​ , maka tentukan nilai t !

Diketahui . Jika  dan panjang proyeksi orthogonal  pada  yaitu , maka tentukan nilai !

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nilai adalah − 1 dan .

nilai begin mathsize 11px style t end style adalah  dan 1 half.

Pembahasan

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Panjang proyeksi orthogonal pada adalah maka nilai t yang memenuhi adalah Jadi, nilai adalah − 1 dan .

begin mathsize 14px style cos space 60 degree equals fraction numerator a with rightwards arrow on top times b with rightwards arrow on top over denominator open vertical bar a with rightwards arrow on top close vertical bar open vertical bar b with rightwards arrow on top close vertical bar end fraction 1 half equals fraction numerator a with rightwards arrow on top times b with rightwards arrow on top over denominator square root of t squared plus open parentheses 2 t plus 1 close parentheses squared plus open parentheses negative t square root of 3 close parentheses end root open vertical bar b with rightwards arrow on top close vertical bar end fraction 1 half square root of t squared plus 4 t squared plus 4 t plus 1 plus 3 t squared end root equals fraction numerator a with rightwards arrow on top times b with rightwards arrow on top over denominator open vertical bar b with rightwards arrow on top close vertical bar end fraction 1 half square root of 8 t squared plus 4 t plus 1 end root equals fraction numerator a with rightwards arrow on top times b with rightwards arrow on top over denominator open vertical bar b with rightwards arrow on top close vertical bar end fraction end style  

Panjang proyeksi orthogonal begin mathsize 14px style a with rightwards arrow on top end stylepada begin mathsize 14px style b with rightwards arrow on top end style adalah

table attributes columnalign right center left columnspacing 0px end attributes row cell 1 half square root of 5 end cell equals cell fraction numerator a with rightwards arrow on top times b with rightwards arrow on top over denominator vertical line b with rightwards arrow on top vertical line end fraction end cell row cell up diagonal strike 1 half end strike square root of 5 end cell equals cell up diagonal strike 1 half end strike square root of 8 t squared plus 4 t plus 1 end root end cell row cell 8 t squared plus 4 t plus 1 space space end cell equals 5 row cell 8 t squared plus 4 t plus 1 minus 5 end cell equals 0 row cell 8 t squared plus 4 t minus 4 end cell equals 0 row cell left parenthesis 8 t minus 4 right parenthesis left parenthesis t plus 1 right parenthesis end cell equals cell 0 space space end cell end table

maka nilai t yang memenuhi adalah

table attributes columnalign right center left columnspacing 0px end attributes row blank blank cell table row cell 8 t equals 4 end cell atau cell t equals negative 1 end cell row cell t equals 1 half end cell atau cell t equals negative 1 end cell end table end cell end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank space end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank space end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank space end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank space end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank space end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank space end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank space end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank space end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank space end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank space end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank space end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank space end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank space end table  

Jadi, nilai begin mathsize 11px style t end style adalah  dan 1 half.

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