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a. x² -9 = 0
a = 1
b = 0
c = -9
D = b² -4ac
= 0 -4(1)(-9)
= 0 +36
= 36
b. x² -25 = 0
a = 1
b = 0
c = -25
D = b² -4ac
= 0 -4(1)(-25)
= 0 +100
= 100
Itu jawabannya.