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

Toán Lớp 8: Tìm x: a) (2x – 1)2 – (2x – 3)(2x + 3) + 3x = 4 b) x2 + 3x = 0 GIÚP MÌNH VỚI MÌNH CẢM ƠN!

Toán Lớp 8: Tìm x:
a) (2x – 1)2 – (2x – 3)(2x + 3) + 3x = 4
b) x2 + 3x = 0
GIÚP MÌNH VỚI MÌNH CẢM ƠN!

Comments ( 1 )

  1. a, (2x-1)^2-(2x-3)(2x+3)+3x=4
    ⇒4x^2-4x+1-(4x^2-9)+3x=4
    ⇒4x^2-4x+1-4x^2+9+3x=4
    ⇒-x+10=4
    ⇒-x=-6
    ⇒x=6
    b, x^2+3x=0
    ⇒x(x+3)=0
    ⇒x=0 hoặc x+3=0 ⇒ x=-3

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

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