297 x 297 – 203 x203 /94

 297 x 297 - 203 x 203/94 

 297² - 203²/94 

in this sum  we will use identity III ,

(a² - b²) = (a - b) ( a + b )

(297-203) (297 + 203) / 94

94 x 500/94

so ans is 500