1.

Pls help i need step by step explanation

Answer»

{31}^{3} - {30}^{3}

\implies {(3 0 + 1)}^{3} - {30}^{3}

\purple{ \sf{since : }}

\red{ \boxed{{(a + b)}^{3} = {a}^{3} + {b}^{3} + 3ab(a + b)}}

\implies \cancel{{30}^{3} } + {1}^{3} + 3(30)(1)(30 + 1) - \cancel{{30}^{3} }

\implies 1 + (90) ( 31 )

\implies 1 +27 90

\orange{\therefore 2791}


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