Question

evaluate (99^2 -1 ) using suitable property​

Answer 1

given:-

$( {99}^{2} - 1)$

as we know,

$( {a}^{2} - {b}^{2} ) = (a + b)(a - b)$

so,

$({99}^{2} - {1}^{2} )$

$= (99 + 1)(99 - 1)$

$= 100 \times 98$

$= 9800$