đa thức x^2 -4x+x (x+y)^2-(x-y)^2 (4x+2)x(4x-2) thành nhân tử

Question

đa thức x^2 -4x+x
(x+y)^2-(x-y)^2
(4x+2)x(4x-2) thành nhân tử

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Alexandra 3 tuần 2021-11-21T06:34:30+00:00 2 Answers 2 views 0

Answers ( )

    0
    2021-11-21T06:35:33+00:00

    a,$x²-4x+x$

    $=x²-3x$

    $=x(x-3)$

    b,$(x+y)²-(x-y)²$

    $=(x+y+x-y)(x+y-x+y)$

    $=2x.2y$

    $=4xy$

    c,$(4x+2)x(4x-2)$

    $=x(16x²-4)$

     

    0
    2021-11-21T06:36:08+00:00

    `x^2 -4x+x`

    `=x^2-(4x-x)`

    `=x^2-3x`

     `(x+y)^2-(x-y)^2`

    `=(x^2 +2xy+y^2)-(x^2-2xy+y^2)`

    `=x^2 +2xy+y^2-x^2+2xy-y^2`

    `=4xy`

    `(4x+2)x(4x-2)`

    `=4(4x-2).x^2+2x(4x-2)`

    `=16x^3-8x^2+2x(4x-2)`

    `=16x^3-8x^2+8x^2-4x`

    `=16x^3-(8x^2+8x^2)-4x`

    `=16x^3-4x`

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