Exercício sobre fatoração

Fatore:

$\,12a^3b^2\,-\,30a^2b^3\,$

$\,xy\,+\,3x\,+\,4y\,+\,12\,$

$\,6ab\,+\,4b^3\,+\,15a^3\,+\,10a^2b^2\,$

$\,a^2 \,-\, 25\,$

$\,x^2\,-\,1\,$

$\,x^4\,-\,1\,$

$\,144\,-\,81a^2b^2\,$

resposta: a)$\,6a^2b^2(2a-5b)\,$
b) $\,(x+4) \centerdot (y+3)\,$
c) $\,(2b+5a^2) \centerdot (3a+2b^2)\,$
d) $\,(a+5) \centerdot (a-5)\,$
e) $\,(x+1) \centerdot (x-1)\,$
f) $\,(x^2+1) \centerdot (x+1) \centerdot (x-1)\,$
g) $\,9(4+3ab) \centerdot (4-3ab)\,$

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