Question

15. M-M dijawab beserta cara pengerjaan ​

Answer 1

f(x) = 2x² + 7x - 4

Memotong sumbu x maka, y = 0

→ 2x² + 7x - 4 = 0

→ [tex] \tt x_{1,2} = \frac{-b \pm \sqrt{b^2 - 4ac}}{2a}[/tex]

→ [tex] \tt x_{1,2} = \frac{-7 \pm \sqrt{7^2 - 4(2)(-4)}}{2(2)} [/tex]

→ [tex] \tt x_{1,2} = \frac{-7 \pm \sqrt{49 + 32}}{4} [/tex]

→ [tex] \tt x_{1,2} = \frac{-7 \pm \sqrt{81}}{4} [/tex]

→ [tex] \tt x_{1,2} = \frac{-7 \pm 9}{4} [/tex]

• x1 = -16/4 = -4 → (-4, 0)
• x2 = 2/4 = ½ → (½, 0)

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Jawaban A. (-4, 0) dan (½, 0)

@BeruangGemoy :•