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P(-2) = 0
0 = (-2)^4 - m(-2)² -10(-2) + 24
0 = 16 - 4m + 20 + 24
4m = 60
m = 15
P(x) = x^4 - 15x² - 10x + 24
a4 = 1, a3 = 0; ao = 0
Lihat dalil Vieta pada lampiran:
a. x1 + x2 + x3 + x4 = - a3/a4 = - 0/1 = 0
b. x1.x2.x3.x4 = (-1)^4 ao/a4 = 24/1 = 24