1,
a)(a-3)²=a²-6a+9
б)(2y+5)²=4y²+20y+25
в)(4x+y)(4x-y)=16x²-4xy+4xy-y²=46x²-y²
г)(x²-1)(x²+1)=x4-1
2
а)c²-0.25=(c+0.5)(c-0.5)
б)x²-8x+16=(x-4)²
3,
(x+4)²-(x-2)(x+2)=x²+8x+16-x²-4=
8x+12
x=0.125
8x0,125+12=13
4.a)2(3x-2y)(3x+2y)=2(9x²-4y)=18x²-8y
б)(a3+b3)²=a6+2a3b3+b6
в)(a-5)²-(a+5)²=a²-10a+25-a²+10a-25=0
5.a)(2x-5)²-(2x-3)(2x+3)=0
4x²-20x+25-4x²-9=0
-20x=9
x=-0.45
b)9y²-25=0
(3y-5)(3y+5)=0