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

Toán Lớp 8: 16x^2+48x+36 tai x=-3/2 ( giup em voi )

Toán Lớp 8: 16x^2+48x+36 tai x=-3/2 ( giup em voi )

Comments ( 2 )

  1. $= 4(4x^2 + 12x + 9)$
    $= 4(2x+3)^2$
    Thay x=-3/2 ta có:
    $4(2.-3/2+3)^2$ 
    $= 4(-3+3)^2$
    $= 4.0^2$
    $=0$

  2. #tnvt
    16x^2+48x+36
    =(4x)^2+2.4x.6+6^2
    =(4x+6)^2
    Tại x=-3/2
    =(4. -3/2 +6)^2
    =(-6+6)^2
    =0^2
    =0

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