Pertanyaan

Diketahui x 1 dan x 2 adalah akar − akar persamaan kuadrat x 2 − 7 x + 10 = 0. Nilai dari x 1 2 + x 2 2 − x 1 x 2 = ....

$Diketahui x_{1} dan x_{2} adalah akar - akar persamaan kuadrat x^{2} - 7 x + 10 = 0. Nilai dari x_{1}^{2} + x_{2}^{2} - x_{1} x_{2} = ....$

-23
-3
10
19
23

F. Pratama

Master Teacher

Mahasiswa/Alumni Universitas Putra Indonesia YPTK Padang

Jawaban terverifikasi

Pembahasan

$U n t u k space p e r s a m a a n space k u a d r a t space a x squared plus b x plus c equals 0 space y a n g space m e m i l i k i space a k a r space x subscript 1 d a n space x subscript 2 comma m a k a x subscript 1 plus x subscript 2 equals fraction numerator negative b over denominator a end fraction x subscript 1 x subscript 2 equals c over a$

$P e r s a m a a n space k u a d r a t space x squared minus 7 x plus 10 equals 0 space d e n g a n space a equals 1 comma space b equals negative 7 space d a n space c equals 10 comma space m e m i l i k i space a k a r minus a k a r space x subscript 1 d a n space x subscript 2 comma space m a k a x subscript 1 plus x subscript 2 equals fraction numerator negative b over denominator a end fraction equals fraction numerator negative left parenthesis negative 7 right parenthesis over denominator 1 end fraction equals 7 x subscript 1 x subscript 2 equals c over a equals 10 over 1 equals 10$