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(3a + 2)(2a - 1) =
6a² - 3a + 4a - 2 = 6a² - a - 2
= 6a² - 1a - 2
jadi koefisien a = -1 (d.)
2). (4x - 8)(3 - 2x) = 12x - 8x² - 24 + 16x
= -8x² + 28x - 24 karena x² nya minus
maka dijadikan => 8x² - 28x + 24 =
8 + (- 28) + 24 = -4 (b.)