3 + 23x - 8x2 = ?
3 + 23x - 8x2
By using Splitting the middle term
= 3 + 23x - 8 x2
= 3 + (24 - 1)x - 8 x2
= 3(1 + 8x) - x(1 + 8x)
= (1 + 8x)(3 - x)