Pertanyaan

A ka r − aka r p ers amaan x 2 + ( a − 1 ) x + 2 = 0 a d a l ah α d an β . J ika α = 2 β d an a > 0 maka ni l ai a = ...

$A ka r - aka r p ers amaan x^{2} + (a - 1) x + 2 = 0 a d a l ah α d an β . J ika α = 2 β d an a > 0 maka ni l ai a = ...$

F. Kurnia

Master Teacher

Mahasiswa/Alumni Universitas Jember

Jawaban terverifikasi

Pembahasan

$x squared plus left parenthesis a minus 1 right parenthesis x plus 2 equals 0 rightwards arrow A equals 1 comma B equals a minus 1 comma C equals 2 • P e n j u m l a h a n space a k a r minus a k a r alpha plus beta equals negative B over A alpha plus beta equals negative fraction numerator left parenthesis a minus 1 right parenthesis over denominator 1 end fraction alpha plus beta equals 1 minus a horizontal ellipsis horizontal ellipsis horizontal ellipsis left parenthesis 1 right parenthesis • P e r k a l i a n space a k a r minus a k a r alpha beta equals C over A alpha beta equals 2 over 1 alpha beta equals 2 horizontal ellipsis horizontal ellipsis horizontal ellipsis left parenthesis 2 right parenthesis S u b s t i t u s i space alpha equals 2 beta space k e space p e r s a m a a n space left parenthesis 2 right parenthesis space m a k a space d i p e r o l e h comma 2 beta squared equals 2 beta squared equals 1 rightwards arrow beta equals plus-or-minus 1 M a k a space k i t a space d a p a t space m e n g e t a h u i space alpha space m e l a l u i space alpha equals 2 beta rightwards arrow alpha equals 2 left parenthesis plus-or-minus 1 right parenthesis equals plus-or-minus 2 comma space s e h i n g g a alpha plus beta equals 1 minus a 2 plus 1 equals 1 minus a 3 equals 1 minus a minus a equals 3 minus 1 a equals negative 2 A t a u space alpha plus beta equals 1 minus a minus 2 minus 1 equals 1 minus a 1 minus a equals negative 3 minus a equals negative 4 a equals 4 K a r e n a space a greater than 0 space m a k a space y a n g space m e m e n u h i space a d a l a h space a equals 4.$