Persamaan Kuadrat
Authored by diyah ayu
Mathematics
9th - 12th Grade
Used 6+ times
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20 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 2 pts
Bentuk umum dari persamaan kuadrat x( x – 4 ) = 2x + 3 adalah....
A. x2 – 2x + 3 = 0
B. x2 + 6x – 3 = 0
C. x2 - 6x - 3 = 0
D. x2 – 8x – 3 = 0
Answer explanation
Penyelesaian :
x (x – 4) = 2x + 3
• x2 – 4x = 2x + 3
• x2 – 6x – 3 = 0
Jadi, bentuk umum persamaan kuadrat x (x – 4) = 2x + 3 adalah x2 – 6x – 3 = 0
2.
MULTIPLE CHOICE QUESTION
30 sec • 2 pts
Di bawah ini yang merupakan persamaan kuadrat adalah
A. 0 = x² + 2x + 1
B. 2 x + 3y + 6 = 0
C. x + y = 0
D. 0 = x + 3
3.
MULTIPLE CHOICE QUESTION
30 sec • 2 pts
Jenis akar-akar dari x² + 5x - 2 = 0 adalah
A. 2 akar riil yang berbeda
B. 2 akar riil yang sama
C. Tidak mempunyai akar riil
D. 1 riil dan 1 tidak riil
Answer explanation
D = b² - 4ac
= 5² - 4.1.(-2)
= 25 - (-8)
= 25 + 8
= 33
=> D > 0
4.
MULTIPLE CHOICE QUESTION
20 sec • 2 pts
Bagaimana cara untuk menentukan akar-akar persamaan kuadrat, kecuali....
A. memfaktorkan
B. melengkapi kuadrat sempurna
C. Membagi
D. menggunakan rumus
5.
MULTIPLE CHOICE QUESTION
20 sec • 2 pts
Rumus persamaan kuadrat...
A. ax + c + bx = 0
B. c+ ax + bx² = 0
C. cx + ax² + b = 0
D. ax²+ bx + c = 0
6.
MULTIPLE CHOICE QUESTION
30 sec • 2 pts
Suatu persamaan kuadrat memiliki akar 2 dan - 5 maka persamaan kuadratnya adalah
Persamaan kuadratnya adalah....
A. x² - x - 10 = 0
B. x² +3x + 10 =0
C. x² - 2x + 5 = 0
D. x² +3x - 10 =0
Answer explanation
(x – x1)(x – x2) = 0
(x – (2))(x – (-5)) = 0
(x – 2)(x + 5) = 0
x² – 2x + 5x – 10 = 0
x² +3x – 10 = 0
7.
MULTIPLE CHOICE QUESTION
30 sec • 2 pts
Persamaan kuadrat yang akar-akarnya 2 atau – 5 adalah…
A. x2 + x + 5 = 0
B. x2 + 3x + 10 = 0
C. x2 + 3x – 10 = 0
D. x2 – 3x + 10 = 0
Answer explanation
(x – 2) (x – (-5) = 0
(x – 2) (x + 5) = 0
x2 + 5x – 2x – 10 = 0
x2 + 3x – 10 = 0
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