20 days become a photography expert: Travel Photography Notes(Chinese Edition)

20 days become a photography expert: Travel Photography Notes(Chinese Edition)

Matematika ✨Quiz✨
-Rules
•Jangan nyawab ngasal (Report)
•Harus Pakek cara
•Pakek cara + benar (jawaban tercerdas)

*Soal kelas 7 - 9 SMP
#Habisin-1000-poin

✨Quiz✨
-Rules
•Jangan nyawab ngasal (Report)
•Harus Pakek cara
•Pakek cara + benar (jawaban tercerdas)

*Soal kelas 7 - 9 SMP
#Habisin-1000-poin

PEMBAHASAN

x² - 3x - 10 = 0

a = 1

b = -3

c = -10

[tex](x1 , x2) = \frac{ - b± \sqrt{ {b}^{2} - 4ac } }{2a} [/tex]

[tex](x1 , x2) = \frac{ - ( - 3)± \sqrt{ {( - 3)}^{2} - 4.1. - 10 } }{2.1} [/tex]

[tex](x1 , x2) = \frac{ 3± \sqrt{ 9 -( - 40)} }{2} [/tex]

[tex](x1 , x2) = \frac{ 3± \sqrt{ 9 + 40} }{2} [/tex]

[tex](x1 , x2) = \frac{ 3± \sqrt{49} }{2} [/tex]

[tex](x1 , x2) = \frac{ 3±7}{2} [/tex]

menentukan x1

[tex]x1 = \frac{3 + 7}{2} [/tex]

[tex]x1 = \frac{10}{2} [/tex]

[tex]x1 = 5[/tex]

menentukan x2

[tex]x2 = \frac{3 - 7}{2} [/tex]

[tex]x2 = - \frac{4}{2} [/tex]

[tex]x2 = - 2[/tex]

Kesimpulan:

Jadi, akar-akarnya adalah (-2 , 5) (opsi A).

Jawaban:

a

Penjelasan dengan langkah-langkah:

x² - 3x - 10

( x - 5 ) ( x+ 2 )

x = 5,- 2

- 2 , 5

( - 2 , 5 )

____________________

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