(2p+9)3-p(3p-7)²=
(2p+9)²(2p+9)-p(3p-7)²=
(4p²+81+36p)(2p+9)-p(9p²+49-42p)=
8p3+162p+72p+36p²+729+324p-(9p3+49p-42p²)=
8p3+162p+72p+36p²+729+324p-9p3-49p+42p²=
-p3+78p²+509p+729
7b(3b-2) -(b+1)(6-9b)=
7b(3b-2) -3(b+1)(2-3b)=
7b(3b-2) +3(b+1)(3b-2)=
(3b-2)(7b+3b+3)=
(3b-2)(10b+3)
(2b-5)²=(3b+11)²
4b²+25-20b=9b²+121+66b
4b²+25-20b-9b²-121-66b=0
-5b²-86b-96=0
discriminant
86²-4(-5x-96)=7396-4(480)=5476=74²
86-74/-10=-1,2
86+74/-10=-16
il y a 2 solutions
-1,2 et -16
