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= x^2 -3x +2x - 6
= x^2 -x - 6
b) (2x-3)(x+4)
= 2x^2 + 8x - 3x - 12
= 2x^2 + 5x - 12
c) (4k+1)^2
= 16k^2 + 8k + 1
d) (3m+2n)(3m-2n)
= 9m^2 - 6mn + 6mn - 4n^2
= 9m^2 - 4n^2
e) (3-a)(5+a)
= 15 + 3a - 5a - a^2
= 15 - 2a - a^2
f) (2+a)(a^2 - 2a + 1)
= 2a^2 - 4a + 2 + a^3 - 2a^2 + a
= a^3 - 3a + 2
(x+2)(x-3) = x² - 3x + 2x - 6
= x² - x - 6
jawaban soal B
(2x-3)(x+4) = 2x² + 8x - 3x - 12
= 2x² + 5x - 12
jawaban soal C
(4k+1) ² = ( 4k +1) (4k +1)
= 16k² + 4k + 4k + 1
= 16k² + 8k + 1
jawaban soal D
(3m+2n) (3m-2n)
= 9m² - 6mn + 6mn - 4n²
= 9m² - 4n²
jawaban soal E
(3-a)(5+a) = 15 + 3a - 5a - a²
= 15 - 2a - a²
jawaban soal F
(2+a)(a²-2a+1)
= 2a² - 4a + 2 + a³ - 2a² + a
= a³+2a² - 2a² - 4a + a + 2
= a³ - 4a + a + 2
= a³ - 3a + 2