Jawab:
1. B2. A3. B
Penjelasan dengan langkah-langkah:
1. 2x (x + 5) = 3x - 4(=) 2x² + 10x = 3x - 4(=) 2x² + 10x - 3x + 4 = 0(=) 2x² + 7x + 4 = 0 (B)2. x² - 4 = 3(x - 2); ax² + bx + c = 0; ditanya a, b, dan c(=) x² - 4 = 3x - 6(=) x² - 3x - 4 + 6 = 0(=) x² - 3x + 2 = 0karena ax² + bx + c = 0, maka a = 1, b = -3, dan c = 2∴ 1, -3, 2 (A)3. 3x² - 6x = 0(=) 3x(x - 2) = 0 (B)
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Jawab:
1. B
2. A
3. B
Penjelasan dengan langkah-langkah:
1. 2x (x + 5) = 3x - 4
(=) 2x² + 10x = 3x - 4
(=) 2x² + 10x - 3x + 4 = 0
(=) 2x² + 7x + 4 = 0 (B)
2. x² - 4 = 3(x - 2); ax² + bx + c = 0; ditanya a, b, dan c
(=) x² - 4 = 3x - 6
(=) x² - 3x - 4 + 6 = 0
(=) x² - 3x + 2 = 0
karena ax² + bx + c = 0, maka a = 1, b = -3, dan c = 2
∴ 1, -3, 2 (A)
3. 3x² - 6x = 0
(=) 3x(x - 2) = 0 (B)