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ex 3 va rog!!! dau coroana

Ex 3 Va Rog Dau Coroana class=

Răspuns :

a)(x+1)(x+3)²-4(x+1)=
(x+1)(x²+6x+9)-4x-4=
x³+6x²+9x+x²+6x+9-4x-4=
x³+7x²+11x+5

c)(x-3)(x+2)²-x+3=
(x-3)(x²+4x+4)-x+3=
x³+4x²+4x-3x²-12x-12-x-3=
x³+x²-9x-15

e)(x+7)²-25=
x²+14x+49-25=
x²+14x+24

g)(x-6)²-9x²=
x²-12x+36-9x²=
-8x²-12x+36
succes