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Diketahui fungsi  dan . a. Hitunglah , , , , , da...

Diketahui fungsi begin mathsize 14px style f colon R rightwards arrow R end style dan begin mathsize 14px style f left parenthesis x right parenthesis equals x squared plus 2 x minus 3 end style.

a. Hitunglah begin mathsize 14px style f left parenthesis negative 4 right parenthesis end stylebegin mathsize 14px style f left parenthesis negative 3 right parenthesis end stylebegin mathsize 14px style f left parenthesis negative 2 right parenthesis end styleundefinedundefined, dan undefined

Jawaban:

Diketahui suatu fungsi begin mathsize 14px style f left parenthesis x right parenthesis equals x squared plus 2 x minus 3 end style.

Untuk menentukan nilai begin mathsize 14px style f left parenthesis negative 4 right parenthesis end style, perhatikan perhitungan berikut.

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell f left parenthesis x right parenthesis end cell equals cell x squared plus 2 x minus 3 end cell row cell f left parenthesis negative 4 right parenthesis end cell equals cell left parenthesis negative 4 right parenthesis squared plus 2 left parenthesis negative 4 right parenthesis minus 3 end cell row blank equals cell 16 minus 8 minus 3 end cell row blank equals 5 end table end style 

Untuk menentukan nilai begin mathsize 14px style f left parenthesis negative 3 right parenthesis end style, perhatikan perhitungan berikut.

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell f left parenthesis x right parenthesis end cell equals cell x squared plus 2 x minus 3 end cell row cell f left parenthesis negative 3 right parenthesis end cell equals cell left parenthesis negative 3 right parenthesis squared plus 2 left parenthesis negative 3 right parenthesis minus 3 end cell row blank equals cell 9 minus 6 minus 3 end cell row blank equals 0 end table end style 

Untuk menentukan nilai begin mathsize 14px style f left parenthesis negative 2 right parenthesis end style, perhatikan perhitungan berikut.

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell f left parenthesis x right parenthesis end cell equals cell x squared plus 2 x minus 3 end cell row cell f left parenthesis negative 2 right parenthesis end cell equals cell left parenthesis negative 2 right parenthesis squared plus 2 left parenthesis negative 2 right parenthesis minus 3 end cell row blank equals cell 4 minus 4 minus 3 end cell row blank equals cell negative 3 end cell end table end style 

Untuk menentukan nilai begin mathsize 14px style f left parenthesis negative 1 right parenthesis end style, perhatikan perhitungan berikut.

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell f left parenthesis x right parenthesis end cell equals cell x squared plus 2 x minus 3 end cell row cell f left parenthesis negative 1 right parenthesis end cell equals cell left parenthesis negative 1 right parenthesis squared plus 2 left parenthesis negative 1 right parenthesis minus 3 end cell row blank equals cell 1 minus 2 minus 3 end cell row blank equals cell negative 4 end cell end table end style 

Untuk menentukan nilai begin mathsize 14px style f left parenthesis 0 right parenthesis end style, perhatikan perhitungan berikut.

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell f left parenthesis x right parenthesis end cell equals cell x squared plus 2 x minus 3 end cell row cell f left parenthesis 0 right parenthesis end cell equals cell left parenthesis 0 right parenthesis squared plus 2 left parenthesis 0 right parenthesis minus 3 end cell row blank equals cell 0 plus 0 minus 3 end cell row blank equals cell negative 3 end cell end table end style 

Untuk menentukan nilai begin mathsize 14px style f left parenthesis 2 right parenthesis end style, perhatikan perhitungan berikut.

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell f left parenthesis x right parenthesis end cell equals cell x squared plus 2 x minus 3 end cell row cell f left parenthesis 2 right parenthesis end cell equals cell left parenthesis 2 right parenthesis squared plus 2 left parenthesis 2 right parenthesis minus 3 end cell row blank equals cell 4 plus 4 minus 3 end cell row blank equals 5 end table end style 

Jadi, nilai dari begin mathsize 14px style f left parenthesis negative 4 right parenthesis equals 5 end stylebegin mathsize 14px style f left parenthesis negative 3 right parenthesis equals 0 end stylebegin mathsize 14px style f left parenthesis negative 2 right parenthesis equals negative 3 end stylebegin mathsize 14px style f left parenthesis negative 1 right parenthesis equals negative 4 end stylebegin mathsize 14px style f left parenthesis 0 right parenthesis equals negative 3 end style, dan begin mathsize 14px style f left parenthesis 2 right parenthesis equals 5 end style.

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