Toán Lớp 8: $x(x-2)-x^2=4^{}$
giúp mk câu này
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Toán Lớp 8: $x(x-2)-x^2=4^{}$
giúp mk câu này
Comments ( 2 )
=>x(x-2)-x²-4=0
=>x²-2x-x²-4=0
=>(x²-x²)-2x-4=0
=>0-2x-4=0
=>-2x-4=0
=>-2x=0+4=4
=>x=4:(-2)
=>x=-2
Vậy x=-2