Toán Lớp 8: Tìm x
x . ( 4x – 5 ) – ( 2x + 1 )² = 0
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Toán Lớp 8: Tìm x
x . ( 4x – 5 ) – ( 2x + 1 )² = 0
Comments ( 2 )
<=> 4x^2-5x-(4x^2+4x+1)=0
<=> 4x^2-5x-4x^2-4x-1=0
<=> -9x-1=0
<=> -9x=1
<=> x=-1/9