Réponses

2013-09-29T12:19:04+02:00
H(x) = (9+4x)² -(2-x)²
81 +16x² +72x -(4 -4x +x²)
81 +16x² +72x -4 +4x -x²
15x² +76x +77 

K(x) = -(7x)² - (-7x)² +(2-x)(2+x)
-(49x²) -(+49x²) + (4 +2x -2x -x²)
-49x² -49x² +4 -x²
-99x² +4