Question

What is the square of the number 98

Answer 1

Answer:

$\: \: \: \: ( {98})^{2}$

$= (100 - 2) ^{2}$

$= {(100)}^{2} - 2 \times 100 \times 2 + {(2)}^{2}$

$= 10000 - 400 + 4$

$= 10004 - 400$

$=9 604$

Note we using this formula :

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