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b/2√a (dgn syarat ketika koef dr akar koefisien yg ada x² bila dijumlah hslnya 0)
Hasilnya:
4/(2√4) + 6/(2√9) + (-15/(√25)) = 4/4 + 6/6 - 15/5
= 1 + 1 - 3
= -1