Matematika

Pertanyaan

Hitunglah perkalian 1. (3a+5) (3a.5) 2. (7p - 5) (-3p+4) 3.(8x - 9) (2x + 9) 4. (6y+5) (-3y - 9) 5.(4b - 9) (-7b + 8)

1 Jawaban

  • 1. (3a + 5) (15a) = 45a² + 75a

    2. (7p - 5) (-3p + 4) = -21p² + 28p + 15p - 20 = -21p² + 43p - 20

    3. (8x - 9) (2x + 9) = 16x² + 72x - 18x - 81 = 16x² + 54x - 81

    4. (6y + 5) (-3y - 9) = -18y² - 54y - 15y - 45 = -18y² - 69y - 45

    5. (4b - 9) (-7b + 8) = -28b² + 32b + 63b - 72 = -28b² + 95b - 72

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