Express ( 3m + 14n )^2 - ( 3m - 14n )^2 as monomial.
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(3m +14n)^2-(3m-14n)^2
= {(3m)^2+2×3m×14n+(14)^2}
-{(3m)^2-2×3m×14n+(14)^2}
=(9m^2+84mn+196n^2) -(9m^2-84mn+196n^2)
=9m^2+84mn+196n^2-9m^2+84mn-196n^2
=168mn
= {(3m)^2+2×3m×14n+(14)^2}
-{(3m)^2-2×3m×14n+(14)^2}
=(9m^2+84mn+196n^2) -(9m^2-84mn+196n^2)
=9m^2+84mn+196n^2-9m^2+84mn-196n^2
=168mn
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