Question

Using suitable identity evaluate 21×23​

Answer 1

$\huge\red{\underline{{\bf A}}}\huge\orange{\underline{{\bf n}}}\huge\green{\underline{{\bf s}}}\huge\blue{\underline{{\bf w}}}\huge\purple{\underline{{\bf e}}}\huge\pink{\underline{{\bf r}}}$

$\rightarrow{21×23}$

$= \: 483$

Answer 2

Answer:

( 20 + 1 ) ( 20 + 3 )

using identity ( x + a ) ( x + b ) = x^2+( a + b )x+ ab

= ( 20 )^2 + (1 + 3 ) 20 + 1×3

= 400 + 80 + 3

= 483

this is your answer....

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