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222-9+11+12:2*14+14 = ? ( )

Toán Lớp 8: làm giúp minh nha ^-^ tìm x biết :(x+1)^2 +(5-x).(x+5)=0

Toán Lớp 8: làm giúp minh nha ^-^
tìm x biết :(x+1)^2 +(5-x).(x+5)=0

Comments ( 2 )

  1. (x+1)^2+(5-x)(x+5)=0
    x^2+2x+1+(5-x)(5+x)=0
    x^2+2x+1+25-x^2=0
    2x+26=0
    2x=-26
    x=-13

  2. (x+1)^2+(5-x)(x+5)=0
    x^2+2x+1+5x+25-x^2-5x=0
    2x+26=0
    2(x+13)=0
    x+13=0
    x=-13
     

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222-9+11+12:2*14+14 = ? ( )