Sagot :
bonjour
( 3 x + 1 )²= 9 x² + 6 x + 1
301 ² = ( 300 + 1 )² = 90 000 + 600 + 1 = 90 601
( 3 x - 2 )² + ( x + 6 )²
= 9 x² - 12 x + 4 + x² + 12 x + 36
= 10 x² + 40
bonjour
( 3 x + 1 )²= 9 x² + 6 x + 1
301 ² = ( 300 + 1 )² = 90 000 + 600 + 1 = 90 601
( 3 x - 2 )² + ( x + 6 )²
= 9 x² - 12 x + 4 + x² + 12 x + 36
= 10 x² + 40