Bonsoir,
des identités remarquables
a)
3( 4t² + 20t +25)
=12t² +60t + 75
b)
(x+1) ( 49 -42x +9x²)
= 49x -42x² +9x³ +49 -42 +9x²
= 9x³ -33x² +49x +7
c)
64t² +16t +1 - 9t²
= 55t² +16t +1
d)
-3( u² -2u +1)
= -3u² +6u -3
