tentukan akar² dari persamaan kuadrat :
a. x²-9=0
b. 4x²-49=0
c. x²+9x+14=0
d. 2x²-4x-16=0
a. x²-9=0
b. 4x²-49=0
c. x²+9x+14=0
d. 2x²-4x-16=0
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