Question

please help me find out this factorise 1-a-b+ab​

Answer 1

Answer:

your ans is (a - 1) (b - 1)

Step-by-step explanation:

ab- a=a( b-1)

notice that there will be. 1 without it will simply ne ab

1-b=1(1-b)

it does not match with the upper one

so we will change the signs

1(1-b)=-1(b-1) ( try to multiply them)

then down in one expression

a(b-1) -1 (b-1)

you get

(a-1) (b-1)

i hope it's helpful 4 u