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Pertanyaan

A page is containing 42 squares inches of printed area. The margins at the top and bottom are each 1 2 1 ​ inches wide while its each side is 1 inch wide. Find the total area is 80 square inches.

A page is containing 42 squares inches of printed area. The margins at the top and bottom are each   inches wide while its each side is 1 inch wide. Find the total area is 80 square inches.

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D. Wahyu

Master Teacher

Mahasiswa/Alumni Universitas Negeri Semarang

Jawaban terverifikasi

Jawaban

solusi dari sistem persamaan dua variabel kuadrat adalah .

solusi dari sistem persamaan dua variabel kuadrat adalah left parenthesis 2 square root of 10 comma 2 square root of 10 right parenthesis space space dan space space open parentheses negative 2 square root of 10 comma negative 2 square root of 10 close parentheses.

Pembahasan

Diketahui: Terlebih dahulu, subtitusikan persamaan (1) ke persamaan (2), sehingga Dengan menggunakan konsep turunan yaitu Dari persamaan (3), turunan adalah Subtitusikan nilai ke persamaan (1), sehingga Jadi, solusi dari sistem persamaan dua variabel kuadrat adalah .

Diketahui:

table attributes columnalign right center left columnspacing 0px end attributes row blank blank cell x times y end cell row x equals cell 40 over y space... left parenthesis 1 right parenthesis end cell row cell f left parenthesis x comma y right parenthesis end cell equals cell 1 1 half x plus 1 1 half y end cell row blank equals cell 3 over 2 x plus 3 over 2 y space... left parenthesis 2 right parenthesis end cell end table

Terlebih dahulu, subtitusikan persamaan (1) ke persamaan (2), sehingga

table attributes columnalign right center left columnspacing 0px end attributes row y equals cell fraction numerator 3 over denominator up diagonal strike 2 end fraction times open parentheses fraction numerator up diagonal strike 4020 over denominator y end fraction close parentheses plus 3 over 2 y end cell row y equals cell 60 over y plus 3 over 2 y space... left parenthesis 3 right parenthesis end cell end table

Dengan menggunakan konsep turunan yaitu

Misalkan space colon space y equals a times x to the power of n comma space maka space turunan space yaitu y apostrophe equals n times a times x to the power of n minus 1 end exponent

Dari persamaan (3), turunan adalah 

table attributes columnalign right center left columnspacing 0px end attributes row cell y apostrophe end cell equals cell fraction numerator negative 60 over denominator y squared end fraction plus 3 over 2 end cell row 0 equals cell fraction numerator negative 60 over denominator y squared end fraction plus 3 over 2 end cell row cell 0 minus 3 over 2 end cell equals cell fraction numerator negative 60 over denominator y squared end fraction end cell row cell negative 3 over 2 end cell equals cell fraction numerator negative 60 over denominator y squared end fraction space left parenthesis Kedua space ruas space dikali space left parenthesis negative right parenthesis right parenthesis end cell row cell 3 over 2 end cell equals cell fraction numerator 60 over denominator y squared space end fraction space left parenthesis Dikali space silang right parenthesis end cell row cell 3 y squared end cell equals 120 row cell y squared end cell equals cell 120 over 3 end cell row cell y squared end cell equals 40 row y equals cell plus-or-minus square root of 40 end cell row y equals cell plus-or-minus square root of 4 times 10 end root end cell row y equals cell plus-or-minus 2 square root of 1 end cell row cell y subscript 1 end cell equals cell 2 square root of 10 space comma space y subscript 2 equals negative 2 square root of 10 end cell end table

Subtitusikan nilai  y subscript 1 space space space dan space space y subscript 2 ke  persamaan (1), sehingga

table attributes columnalign right center left columnspacing 0px end attributes row cell x subscript 1 end cell equals cell fraction numerator 40 over denominator 2 square root of 10 end fraction end cell row blank equals cell fraction numerator 40 over denominator 2 square root of 10 end fraction times fraction numerator square root of 10 over denominator square root of 10 end fraction end cell row blank equals cell fraction numerator up diagonal strike 40 up diagonal strike 4 space 2 end strike end strike square root of 10 over denominator up diagonal strike 2 times up diagonal strike 10 end fraction end cell row blank equals cell 2 square root of 10 end cell row blank blank blank row blank blank blank row cell x subscript 2 end cell equals cell fraction numerator 40 over denominator negative 2 square root of 10 end fraction end cell row blank equals cell fraction numerator 40 over denominator negative 2 square root of 10 end fraction times fraction numerator square root of 10 over denominator square root of 10 end fraction end cell row blank equals cell fraction numerator up diagonal strike 40 up diagonal strike 4 space 2 end strike end strike square root of 10 over denominator up diagonal strike negative 2 end strike times up diagonal strike 10 end fraction end cell row blank equals cell negative 2 square root of 10 end cell row blank blank blank row blank blank blank end table

Jadi, solusi dari sistem persamaan dua variabel kuadrat adalah left parenthesis 2 square root of 10 comma 2 square root of 10 right parenthesis space space dan space space open parentheses negative 2 square root of 10 comma negative 2 square root of 10 close parentheses.

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