1. а) (2x-3)^2=4x^2-12x+9;
б) (5x-1)*(5x+1)+(5x+1)^2=25x^2-1+25x^2+10x+1=50x^2+10x;
2. 7-2(x+3)=9-6x
7-2x-6=9-6x
-2x+6x=9-7+6
4x=8
x=2.
а) (2x-3)^2=4x^2-12x+9
б) (5x-1)*(5x+1)+(5x+1)^2=25x^2-1+25x^2+10x+1=50x^2+10x
7-2(x+3)=9-6x
7-2x-6-9+6x=0
-8+4x=0
x=8/4
x=2
1. а) (2x-3)^2=4x^2-12x+9;
б) (5x-1)*(5x+1)+(5x+1)^2=25x^2-1+25x^2+10x+1=50x^2+10x;
2. 7-2(x+3)=9-6x
7-2x-6=9-6x
-2x+6x=9-7+6
4x=8
x=2.
а) (2x-3)^2=4x^2-12x+9
б) (5x-1)*(5x+1)+(5x+1)^2=25x^2-1+25x^2+10x+1=50x^2+10x
7-2(x+3)=9-6x
7-2x-6-9+6x=0
-8+4x=0
x=8/4
x=2