1.

Factorise 3rd sum from the following

Answer»

Here's your answer mate

USING IDENTITY
( {x}^{3} - {y}^{3} ) = {x}^{3} - {y}^{3} - 3 {x}^{2} y + 3x {y}^{2}
so

Answer is as FOLLOWS::

( {1}^{3} ) - ( {4}^{3} ) - 3 \times ( {1}^{2} ) \times 4 + 3 \times 1 \times {4}^{2}

= (1 + 4)^{3}

Hope it Helps BUDDY!!


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