Mudahkan (x-2) / (x ^ 2 + 6x + 9) - (x + 2) / (2x ^ 2-18)?

Mudahkan (x-2) / (x ^ 2 + 6x + 9) - (x + 2) / (2x ^ 2-18)?
Anonim

Jawapan:

# (x ^ 2-15x + 6) / (2 (x-3) (x + 3) ^ 2) #

Penjelasan:

# x ^ 2 + 6x + 9 = (x + 3) (x + 3) = (x + 3) ^ 2 #

# 2x ^ 2-18 = 2 (x ^ 2-9) = 2 (x-3) (x + 3) #

Perbezaan 2 petak # (a-b) (a + b) = a ^ 2-b ^ 2 #

# (x-2) / (x + 3) ^ 2- (x + 2) / (2 (x-3) (x + 3)) #

Multiply oleh # 2 (x-3) (x + 3) ^ 2 #

= (x-2) (2) (x-3) - (x + 2) (x + 3)) / (2 (x-3) (x + 3) ^ 2)

Kembangkan kurungan

= # (2 (x ^ 2-5x + 6) - (x ^ 2 + 5x + 6)) / (2 (x-3) (x + 3) ^ 2)

Lebih jauh mengembangkan kurungan

= # (2x ^ 2-10x + 12-x ^ 2-5x-6) / (2 (x-3) (x + 3) ^ 2) #

Mudahkan

= # (x ^ 2-15x + 6) / (2 (x-3) (x + 3) ^ 2) #