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

Toán Lớp 8: Tìm X a). x^2-36=0 b). 25+10x+x^2=0

Toán Lớp 8: Tìm X
a). x^2-36=0
b). 25+10x+x^2=0

Comments ( 2 )

  1. #WAB
    a/ $x^2-36=0$
    $⇔ x^2-6^2=0$
    $⇔ (x-6)(x+6)=0$
    $⇔ x=6$ hoặc $x=-6$
    b/ $25+10x+x^2=0$
    $⇔ (5+x)^2=0$
    $⇔ 5+x=0$
    $⇔ x=-5$

  2. a) x²-36=0
    ⇔ x² = 36
    ⇔ x = ±6
    b) 25+10x+x² =0
    ⇔ x² + 10x + 25 = 0
    ⇔ (x+5)² = 0
    ⇔ x + 5 = 0
    ⇔ x = -5

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