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(3a+4)(2a-5) = 6a kuadrat - 15a + 8a - 20= 6a kuadrat -7a-20
(4x-1) (3x+2) = 12x kuadrat + 8x - 3x -2 = 12x kuadrat + 5x -2
=4x^2-14x-14x+49
=4x^2 -28x +49
b. = 6a^2 -15a +8a -20
=6a^2 -7a-20
c. =12x^2 +8x-3x-2
=12x^2 +5x-2
smoga membantu, mohon ditelaah kembali y :-)