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

Toán Lớp 8: x^2+ 2x –24 lm từng bc giúp mik

Toán Lớp 8: x^2+ 2x –24
lm từng bc giúp mik

Comments ( 2 )

  1. x^2+ 2x –24
    =x^2+2x+1-25
    =(x^2+2x+1)-25
    =(x+1)^2-5^2
    =(x+1+5)(x+1-5)
    =(x+6)(x-4)
     

  2. $x^2+ 2x –24$
    $=x^2+(6x-4x) –24$
    $=x^2+6x-4x –24$
    $=(x^2+6x)-(4x+24)$
    $=(x.x+6.x)-(4.x+4.6)$
    $=x(x+6)-4(x+6)$
    $=(x-4)(x+6)$
     

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

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