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

Toán Lớp 8: d. (x + 50)2 + (x + 4)(x – 4) = 0

Toán Lớp 8: d. (x + 50)2 + (x + 4)(x – 4) = 0

Comments ( 1 )

  1. Giải đáp:
    $x \in \varnothing.$
    Lời giải và giải thích chi tiết:
    $d. (x + 50)^2 + (x + 4)(x – 4) = 0\\ \Leftrightarrow x^2+100x+2500 + x^2-16= 0\\ \Leftrightarrow 2x^2+100x+2484= 0\\ \Leftrightarrow 2(x^2+50x+1242)= 0\\ \Leftrightarrow 2(x^2+2.25.x+625+617)= 0\\ \Leftrightarrow 2(x^2+2.25.x+625)+1234= 0\\ \Leftrightarrow \underbrace{2(x+25)^2+1234}_{>0 \ \forall \ x}= 0\\ \Leftrightarrow x \in \varnothing.$

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