Question

factorise 4 - (l- m )
square​

Answer 1

4-(1-m)^2=0

4-(1-2m+m^2)=0

4-1+2m-m^2=0

3+2m-m^2=0

m^2-2m-3=0

m^2+m-3m-3=0

m(m+1)-3(m+1)=0

(m-3)(m+1)=0

m=3,m=-1

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