a) [tex]x^{2} -y^{2} = (x+y)(x-y)[/tex]
b) [tex]a^{10} -49b^{6} = (a^{5} )^{2} -(7b^{3} )^{2}[/tex]
rpta final : [tex](a^{5} + 7b^{3} )(a^{5} -7b^{3} )[/tex]
c)[tex]100-x^{2} y^{6}[/tex]
100=[tex]10^{2}[/tex]
[tex]x^{2} y^{2} =( xy)^{2}[/tex]
[tex]10^{2}[/tex]-(xy)[tex]^{2}[/tex]
=(10 +xy) (10-xy)
