Question

數英渣渣🥺

SOS

(C) (x2
)7. 因式分解(3x+2)(x-1)-(x-2)+7所得的
結果是下列哪一個?
(A) ( 2x+1)(x-1)
(B) (2x-1)(x+1)
(C)(2x+1)(x+1)
D) (2x-1)(x-1)

Answer 1

Mer

3x²-3x+2x-2-(x²-4x+4)+7=3x²-x-2-x²+4x-4+7
=2x²+3x+1=(2x+1)(x+1)