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

Toán Lớp 8: B=4(2x-3)^2-9(4x^2-9)^2 phân tích thành nhân tử

Toán Lớp 8: B=4(2x-3)^2-9(4x^2-9)^2
phân tích thành nhân tử

Comments ( 2 )

  1. ~ Bạn tham khảo ~
    B = 4(2x-3)^2 – 9(4x^2-9)^2
    = 2^2*(2x-3)^2 – 3^2*(4x^2-9)^2
    = (4x-6)^2 – (12x^2-27)^2
    = (4x-6-12x^2+27)(4x-6+12x^2-27)
    = (-12x^2+4x+21)(12x^2+4x-33)
    = (-12x^2+18x-14x+21)(12x^2+22x-18x-33)
    = [-6x(2x-3)-7(2x-3)]*[2x(6x+11)-3(6x+11)]
    = -(2x-3)(6x+7)(2x-3)(6x+11)
    = -(2x-3)^2(6x+7)(6x+11)

  2. B=4(2x-3)^2-9(4x^2-9)^2
    =[2(2x-3)-3(4x^2-9)][2(2x-3)+3(4x^2-9)]
    =[2(2x-3)-3(2x-3)(2x+3)][2(2x-3)+3(2x-3)(2x+3)]
    =(2x-3)(2-6x-9)(2x-3)(2+6x+9)
    =(2x-3)^2(-7-6x)(11+6x)

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