Respuestas

2012-10-10T02:59:35+02:00

1.- (x+1)² = 12+ (x-5)²

     X²+2X+1=12+X²-2.5X+25

         2X+1=-10X+25

           10X+2X=25-1

              12X=24

                   X=2

2.- (x-1)(x+1)- (x+2)(x+3)=5x-1

      X²-1-(X²+5X+6)=5X-1

       X²-1-X²-5X-6=5X-1

          -1+1-6=5X+5X

         10X=-6

           X=-3/5

3.- (x+1) - 9(x-5)= 3(4x+2)

       X+1-9X+45=12X+6

       1+45-6=12X+9X-X

         40=20X

          X=2

 

SUERTE!!!!!!!