Comments (10) on “Write about Burj Khalifa using place and time of prepositions. THANK YOU FAST”

  4. (x + 1)(x - 1)(x² + 9)

    Step-by-step explanation:

    Factorise the following:

    [tex]\longrightarrow[/tex] x⁴ + 8x² - 9

    [tex]\sf x^4 = {(x^2)}^{2}:[/tex]

    [tex]\longrightarrow[/tex][tex]\sf {(x^2)}^{2} + 8x^2 - 9[/tex]

    The factors of -9 that sum to 8 are 9 and -1.

    So,

    [tex]\longrightarrow[/tex][tex]\sf {(x^2)}^{2} + (9 - 1)x^2 - 9[/tex]

    [tex]\longrightarrow[/tex][tex]\sf {(x^2)}^{2} + 9x^2 - x^2 - 9[/tex]

    [tex]\longrightarrow[/tex] x²(x² + 9) - 1(x² + 9)

    [tex]\longrightarrow[/tex] (x² - 1)(x² + 9)

    x² - 1 = x² - 1²:

    (x² - 1²)(x² + 9)

    Factor the difference of two squares.

    x² - 1² = (x + 1)(x - 1):

    [tex]\longrightarrow[/tex] (x + 1)(x - 1)(x² + 9)

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  10. 27.16 m (first one)

    0.475 m (second one)

    27.418 kg (third one)

    Step-by-step explanation:

    1st) 2716 ÷ 100

    2nd) 47.5 ÷ 100

    3rd) 27418 ÷ 1000

    Reply

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