please bantu bsk dikumpul
Matematika
putra1119
Pertanyaan
please bantu bsk dikumpul
1 Jawaban
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1. Jawaban jpallo
1) x² + 8x - 20 = 0 ===> (x + 10)(x - 2) = 0
x + 10 = 0 ===> x₁ = -10
x - 2 = 0 ====> x₂ = 2
2) x² + 6x + 8 = 0 ===> (x + 4)(x + 2) = 0
x + 4 = 0 ===> x₁ = -4
x + 2 = 0 ===> x₂ = -2
3) x² - 2x - 24 = 0 ===> (x - 6)(x + 4) = 0
x - 6 = 0 ===> x₁= 6
x + 4 = 0 ===> x₂ = -4
4) x² - x - 6 = 0 ===> (x - 3)(x + 2) = 0
x - 3 = 0 ===> x₁ = 3
x + 2 = 0 ===> x₂ = -2
5) x² - 7x + 12 = 0 ===> (x - 4)(x - 3) = 0
x - 4 = 0 ===> x₁ = 4
x - 3 = 0 ===> x₂ = 3
6) x² + 2x - 35 = 0 ===> (x +7)(x - 5) = 0
x + 7 = 0 ===> x₁ = -7
x - 5 = 0 ===> x₂ = 5
7) x² - 25 = 0 ===> (x - 5)(x + 5) = 0
x - 5 = 0 ===> x₁ = 5
x + 5 = 0 ===> x₂ = -5
8) 2x² - ....maaf, angkanya tdk jelas
9) 2x² + 6x - 8 = 0 ===> (2x - 2)(x + 4) = 0
2x - 2 = 0 ===> 2x = 2 ===> x₁ = 1
x + 4 = 0 ===> x₂ = -4
10) 3x² - 7x + 2 = 0 ===> (3x - 1)(x - 2) = 0
3x - 1 = 0 ===> 3x = 1 ===> x₁ = 1/3
x - 2 = 0 ===> x₂ = 0
semoga jelas dan membantu ya dan maaf utk no. 8 angkanya kurang jelas