Question

Make pairs :
Section 'A'
(1) (m+n)(m-n)
(2) (m+7)(m-7)
(3) (5+m)(5-m)
(4) (3m-1)(3m+1)

Section 'B'
(a) m²-49
(b)25-m²
(c) 9m²-1
(d) m²-n²

Answer 1

1=d. m^2-n^2
2=a. m^2-49
3=b. 25-m^2
4=c. 9m^2-1