Com simplifiqueu (x + 2) / (4x ^ 2 - 14x + 6) - (x + 4) / (x ^ 2 + x -12)?

Com simplifiqueu (x + 2) / (4x ^ 2 - 14x + 6) - (x + 4) / (x ^ 2 + x -12)?
Anonim

Resposta:

# = -3x ^ 2- 16x + 16 / (x-3) (4x-2) (x + 4)

Explicació:

Primer factor.

# (x + 2) / (4x ^ 2-14x + 6) - (x + 4) / (x ^ 2 + x-12) #

= # (x + 2) / ((x-3) (4x-2)) - (x + 4) / ((x + 4) (x-3)) #

Canviar a fraccions similars obtenint #LCD = (x -3) (4x-2) (x-3) #

= # (x + 2) (x + 4) / ((x-3) (4x-2) (x + 4)) - (x +4) (4x - 2) / ((x-3) (4x-2) (x + 4)) #

= # ((x + 2) (x + 4) - (x + 4) (4x-2)) / ((x-3) (4x-2) (x + 4))

Utilitzeu la propietat distributiva de la multiplicació.

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

Combini termes com ara.

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