Question

using identity find the value of 998 square

Answer 1

998 square

${998 }^{2}$

$= ( {1000 - 2})^{2}$

using

$( {a - b) }^{2} = {a}^{2} - 2ab + {b}^{2} we \: get$

$= {1000}^{2} - 2(1000) \times (2) + {2}^{2}$

$= 1000000 - 4000 + 4$

$= 996004$

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