1397 x 1397 = ?	Choose one
A) 1951798	B) 1987209	C) 1952909	D) 1951609	E) 1958735
1951609   1951609   1397 x 1397 = (1397)2   = (1400 - 3)2   = (1400)2 + (3)2 - (2 x 1400 x 3)   = 1960000 + 9 - 8400   = 1960009 - 8400= 
<gadget id="calculator">1960009 - 8400</gadget>
<output>1_951_609</output>
1951609.
<result>D</result>
1397 x 1397 = ?