因式分解2(7-2X)^2-14X
问题描述:
因式分解2(7-2X)^2-14X
答
2(7-2X)^2-14X
= 2[(7-2x)^2 - 7x]
= 2 [ 49 - 28x + 4x^2 - 7x ]
= 2 ( 49 - 35x + 4x^2 )
= 2(x-7)(4x-7)