factorise a^2-4a+3+2b-b^2 please answer
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Step-by-step explanation:
a^2- 4a +3 +2b -b^2
=a^2 +ab -3a - ab - b^2 + 3b - a - b + 3
=a ( a + b - 3) - b( a + b + 3) - 1 (a +b - 3)
= (a - b - 1) ( a + b - 3)
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