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x² - 2x - 3 adalah (a + 34)x + (b + 42)
selanjutnya (a + 34)x + (b = 42) = 8x + 10
berarti a + 34 = 8
a = 8 - 34
= - 26
b + 42 = 10
b = 10 - 42
= - 32
Jadi a + b = (- 26) + (- 32)
= - 58