A 2x 2 x 1 0 d x 2 x 1 0 b 2x 2 x 1 0 e x 2 x 1 0 c x

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A. 2x 2 + x + 1 = 0 D. x 2 – x + 1 = 0 B. 2x 2 – x + 1 = 0 E. x 2 – x – 1 = 0 C. x 2 + 2x + 1 = 0 7. Persamaan kuadrat x 2 – 3x – 2 = 0 akar– akarnya x 1 dan x 2 . Persamaan kuadrat baru yang akar – akarnya (3x 1 + 1) dan (3x 2 + 1) adalah … a. x 2 – 11x – 8 = 0 b. x 2 – 11x – 26 = 0 c. x 2 – 9x – 8 = 0 d. x 2 + 9x – 8 = 0 e. x 2 – 9x – 26 = 0 8. Jika p dan q adalah akar-akar persamaan x 2 – 5x – 1 = 0, maka persamaan kuadrat baru yang akar-akarnya 2 p + 1 dan 2 q + 1 adalah … a. x 2 + 10x + 11 = 0 d. x 2 – 12x + 7 = 0 b. x 2 – 10x + 7 = 0 e. x 2 – 12x – 7 = 0 c. x 2 – 10x + 11 = 0 9. Akar-akar persamaan kuadrat x 2 +2x + 3 = 0 adalah dan . Persamaan kuadrat akar-akarnya (2 + 1) dan (2 + 1) adalah … . a. x 2 – 2x + 9 = 0 d. x 2 – 9x + 2 = 0 b. x 2 + 2x + 9 = 0 e. x 2 – 9x + 2 = 0 c. x 2 + 2x – 9 = 0 10. Akar-akar persamaan kuadrat x 2 + 4x – 3 = 0 adalah dan . Persamaan kuadrat baru dengan akar 3 + 2 dan 3 + 2 adalah ... a. x 2 + 8x – 47 = 0 d. x 2 + 47x – 8 = 0 b. x 2 – 8x + 47 = 0 e. x 2 + 8x – 51 = 0 c. x 2 – 8x – 47 = 0 11. Jika x 1 dan x 2 adalah akar-akar persamaan x 2 – x + 2 = 0, persamaan kuadrat baru yang akar – akarnya 2x 1 – 2 dan 2x 2 – 2 adalah … a. x 2 + 8x + 1 = 0 d. x 2 – 8x – 2 = 0 b. x 2 + 8x + 2 = 0 e. x 2 – 2x + 8 = 0 c. x 2 + 2x + 8 = 0 12. Persamaan kuadrat 2x 2 + 3x – 5 = 0, mempunyai akar-akar x 1 dan x 2. Persamaan kuadrat baru yang akar-akarnya (2x 1 – 3) dan (2x 2 – 3) adalah … a. 2x 2 + 9x + 8 = 0 d. 2x 2 – 9x + 8 = 0 b. x 2 + 9x + 8 = 0 e. x 2 + 9x – 8 = 0 c. x 2 – 9x – 8 = 0 Kemampuan mengerjakan soal akan terus meningkat jika terus berlatih mengerjakan ulang soal yang lalu 28
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LATIH UN Prog. IPA Edisi 2011 13. x 1 dan x 2 adalah akar-akar persamaan x 2 + 2x – 5 = 0. Persamaan kuadrat baru yang akar-akarnya 2x 1 – 3 dan 2x 2 – 3 adalah ... a. x 2 + 10x + 1 = 0 d. x 2 – 2x + 23 = 0 b. x 2 + 10x 1 = 0 e. x 2 + 2x 23 = 0 c. x 2 – 10x – 1 = 0
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