Respuesta :

Answer:

[tex]=x^3-x^2-30x+72[/tex]

Step-by-step explanation:

Distribute parentheses:

[tex]=xx^2+x\left(-7x\right)+x\cdot \:12+6x^2+6\left(-7x\right)+6\cdot \:12[/tex]

Apply minus - plus rule:

[tex]=x^2x-7xx+12x+6x^2-6\cdot \:7x+6\cdot \:12[/tex]

Simplified:

[tex]=x^3-x^2-30x+72[/tex]

Its complicated but..

Step-by-step explanation:

( x + 6 ) ( x^2 - 7x + 12 )

x ( x^2 - 7x + 12) + 6 ( x^2 - 7x + 12 )

x^3 - 7x^2 + 12x + 6x^2 - 42x + 72

x^3 + 6x^2 + 12x - 42x - 7x^2 + 72

19x - 49x + 72

30x + 72

x = 72/30

x = 2.4

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