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

Toán Lớp 8: ( 4x^2 – 3x – 18 ) ^2 – ( 4x^2 + 3x ) ^2

Toán Lớp 8: ( 4x^2 – 3x – 18 ) ^2 – ( 4x^2 + 3x ) ^2

Comments ( 2 )

  1. ~ Gửi bạn nhea ~
    (4x^2-3x-18)^2-(4x^2+3x)^2
    = [4x^2-3x-18-(4x^2+3x)] * [4x^2-3x-18x+(4x^2+3x)]
    = (4x^2-3x-18-4x^2-3x) * (4x^2-3x-18+4x^2+3x)
    = (-6x-18) * (8x^2-18)
    = [-6(x+3)] * 2(4x^2-3^2)
    = [-6(x+3)] * 2(2x-3)(2x+3)
    = -12(x+3)(2x-3)(2x+3)

  2. Giải đáp:
    =-12(2x-3)(2x+3)(x+3)
    Lời giải và giải thích chi tiết:
    (4x^2-3x-18)^2-(4x^2+3x)^2
    =[(4x^2-3x-18)-(4x^2+3x)][(4x^2-3x-18)+(4x^2+3x)]
    =(4x^2-3x-18-4x^2-3x)(4x^2-3x-18+4x^2+3x)
    =(8x^2-18)(-6x-18)
    =2.(-6)(4x^2-9)(x+3)
    =-12(2x-3)(2x+3)(x+3)

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