Hi,

  |Cross Multiplying to solve

    (x+2)(x+1) = 20

    x^2 + 3x + 2 = 20

    x^2 + 3x - 18 = 0

factoring

   (x+6)(x-3) = 0

   (x+6)=0   x= -6  Extraneous solution(CANNOT divide by zero)

   (x-3) = 0   x =   AND 5/5 = 4/4 = 1 (checking out answer)



the 2nd is completed in a similar manner 

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