Question

( begin{aligned} text { Wh } x=a^{2}-4 a+3+2 b-b^{2} &=left(a^{2}-a-3 a+3+3 b-b-b^{2}right)+a b-a b &=left(a^{2}-a b-aright)+left(a b-b^{2}-bright) &=(-3 a+3 b+3) &=a(a-b-1)+b(a-b-1) &=(a+b-3)(a-b-1) &=(a+b-b-b-1) 0 &=a^{2}-4 a+3+2 b-b^{2}=(a+b-3)(a-b-1) end{aligned} )

# 8. (XW) 14aa- Factorize following expressions (1) a2-4a +3 + 2b - 62 (i

Solution