Jawab:
C. 2 dan 3
Penjelasan dengan langkah-langkah:
1. Salah
(x - 5)(x + 5) = x² + 5x - 5x - 25
= x² - 25
2. Benar
(2x - 1)(3x + 5) = 6x² + 10x - 3x - 5
= 6x² + 7x - 5
3. Benar
4x(x - 3) = 4x² - 12x
4. Salah
(2x - 4)(2x - 4) = 4x² -8x - 8x + 16
= 4x² - 16x + 16
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Verified answer
Jawab:
C. 2 dan 3
Penjelasan dengan langkah-langkah:
1. Salah
(x - 5)(x + 5) = x² + 5x - 5x - 25
= x² - 25
2. Benar
(2x - 1)(3x + 5) = 6x² + 10x - 3x - 5
= 6x² + 7x - 5
3. Benar
4x(x - 3) = 4x² - 12x
4. Salah
(2x - 4)(2x - 4) = 4x² -8x - 8x + 16
= 4x² - 16x + 16