1. х^2+8x+16
б) 9b^2-6bc+c^2
в) y^4-x^2
2. (1/3-a)(1/3+a)
(b+5)^2
3. a^2-4ab+4b^2+4ab-4b^2=a^2 a=4/9
4. 3(1+2xy)(1-2xy)=3-12x^2 y^2
x^4-2x^2y^3+y^6
a^2+2ab+b^2-(a^2-2ab+b^2)=a^2+2ab+b^2-a^2+2ab-b^2=4ab
5. a) 16x^2-9-(16x^2 - 8x+1)=3x
16x^2-9-16x^2+8x-1=3x
-10+8x=3x
-10=-5x
x=2
б) (4с-7)(4с+7)=0
4с-7=0 или 4с+7=0
4с=7 4с=-7
с=1,75 с=-1,75