Which domain restrictions apply to the rational expression? x^2+5x+6/x^2−9 select two correct answers. question 1 options: x≠−3 x≠−2 x≠−1 x≠1 x≠2 x≠3

1) it must be fulfilled that the denominator is different from zero, then for this expression

x^2 -9  ⇒ x^2-3^2 = (x-3)(x+3)⇒ (x-3)(x+3) = 0 ⇒ x = 3 o x = -3 , the dominium is all numbers reals except 3 and -3  

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