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Akar-akar persamaan dari 5 x 2 + 6 x − 7 = 0 5 x 2 +6 x - 7=0 adalah…

Akar-akar persamaan dari  adalah…  

  1. fraction numerator negative 3 plus-or-minus 2 square root of 38 over denominator 5 end fraction

  2. fraction numerator negative 3 plus-or-minus square root of 11 over denominator 5 end fraction

  3. fraction numerator negative 3 plus-or-minus 2 square root of 11 over denominator 5 end fraction

  4. fraction numerator negative 3 plus-or-minus 4 square root of 38 over denominator 5 end fraction

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F. Pratama

Master Teacher

Mahasiswa/Alumni Universitas Putra Indonesia YPTK Padang

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Pembahasan

begin mathsize 14px style 5 straight x squared plus 6 straight x minus 7 equals 0 Diketahui colon straight a equals 5 comma space straight b equals 6 comma space straight c equals negative 7 Rumus space abc comma space yaitu colon straight x subscript 1 comma 2 end subscript equals fraction numerator negative straight b plus-or-minus square root of straight b squared minus 4 ac end root over denominator 2 straight a end fraction straight x subscript 1 comma 2 end subscript equals fraction numerator negative 6 plus-or-minus square root of left parenthesis 6 right parenthesis squared minus 4 left parenthesis 5 right parenthesis left parenthesis negative 7 right parenthesis end root over denominator 2 left parenthesis 5 right parenthesis end fraction straight x subscript 1 comma 2 end subscript equals fraction numerator negative 6 plus-or-minus square root of 36 plus 140 end root over denominator 10 end fraction straight x subscript 1 comma 2 end subscript equals fraction numerator negative 6 plus-or-minus square root of 176 over denominator 10 end fraction straight x subscript 1 comma 2 end subscript equals fraction numerator negative 6 plus-or-minus 4 square root of 11 over denominator 10 end fraction straight x subscript 1 comma 2 end subscript equals fraction numerator negative 3 plus-or-minus 2 square root of 11 over denominator 5 end fraction end style

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