Question

Fatore e resolva:
a)(8+x^2) (x^2-4)
b)x^2-x-6
_________
x^2-7x+12

Answer 1

a)  (8+x^2) (x^2-4) =  (8+x^2) (x + 2)(x - 2) 

8x^2 - 32 + x^4 - 4x^2 ==> x^4 + 4x^2 - 32 ==> (x +8 ) (x - 4)
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b)  x^2-x-6    =  (x - 3)(x + 2 )  ==> x + 2
    x^2-7x+12    (x + 4)(x-3)            x - 4