Toán Lớp 8: x ² – 4 = 0
Dung hang dang thuc
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Toán Lớp 8: x ² – 4 = 0
Dung hang dang thuc
Comments ( 2 )
<=>x^2-2^2=0
<=>(x-2).(x+2)=0
<=>[(x-2=0),(x+2=0):}
<=>[(x=0+2),(x=0-2):}
<=>[(x=2),(x=-2):}
Vậy phương trình có nghiệm S={2;-2}