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a. ʃ 5x(x-2) dx
kalikan saja dulu jadinya
= 5x² - 10x dx
= 5/3 x^³ - 5x² + C
b. ʃ (5x+2)(x-7) dx
kalikan juga
= 5x²-35x+2x-14
= 5x²-33x-14
baru integralkan
= 5/3 x³ - 33/2 x² - 14x + C