jika [tex] x_{1} dan x_{2} adlh akar dri persamaan kuadrat x^{2} +x-7 =0, nilai x_{1} ^{2} + x_{2} ^{2} [/tex] adalah
Matematika
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Pertanyaan
jika [tex] x_{1} dan x_{2} adlh akar" dri persamaan kuadrat x^{2} +x-7 =0, nilai x_{1} ^{2} + x_{2} ^{2} [/tex] adalah
2 Jawaban
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1. Jawaban Anonyme
Persamaan Kuadrat
x² + x - 7 = 0
x1 + x2 = -b/a = -1/1 = -1
x1x2 = c/a = -7/1 = -7
x1² + x2²
= (x1 + x2)² - 2x1x2
= (-1)² - 2(-7)
= 1 + 14
= 15 -
2. Jawaban Sarahnella
x^2+x-7=0
x1 + x2 =-1
x1 × x2 =-7
[tex]x1^{2} + x2 ^{2} [/tex]
((x1+x2)^2)-2(x1x2)
((-1)^2)-2(-7)
1+14
15
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