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Bagian a:
(2x + 3) (x + 4)
= 2x (x + 4) + 3 (x + 4)
= 2x^2 + 8x + 3x + 12
= 2x^2 + 11x + 12
Bagian b:
(3x + 2) (x - 5)
= 3x (x - 5) + 2 (x - 5)
= 3x^2 - 15x + 2x - 10
= 3x^2 - 13x - 10
Nomor 2:
(a + 3) (a + 5)
= a (a + 5) + 3 (a + 5)
= a^2 + 5a + 3a + 15
= a^2 + 8a + 15
Jawaban = b. a^2 + 8a + 15
Nomor 3:
5 (2x + 4) + 3 (2x^2 + x - 2)
= 10x + 20 + 6x^2 + 3x - 6
= 6x^2 + 10x + 3x + 20 - 6
= 6x^2 + 13x + 14
Jawaban = d. 6x^2 + 13x + 14