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(x+3)(x+1)>0, solve the quadratic inequality and answer in interval notation.

PS. I know the answer but I need explanation

Respuesta :

Panoyin

(x + 3)(x + 1) > 0

x + 3 > 0 or x + 1 > 0

x > -3 x > -1

(-3, ∞) ∪ (-1, ∞)

This shows that you have to separate the two factors in order to find the solution to the quadratic inequality.

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