9yˇ4+25-30yˇ2=(3yˇ2)ˇ2-30yˇ2+5ˇ2=(3yˇ2-5)ˇ2
0.5x(20x^4+8x²-5x²-2)=
=0.5x(20x^4+3x²-2)=
=10x^5+1.5x^3-1x
( 2x - 1 ) ^2 - 5 = 4x^2 - 3(X - 1 ) ;
4x^2 - 4x + 1 - 5 = 4x^2 - 3x + 3 ;
- 4x + 3x = 3 + 4 ;
X = 7
1)3xˇ2+x3=xˇ2(3+x)
16xˇ2-4=4(4xˇ2-1)=4.(2x+1)(2x-1)
2x+6+xˇ2+3x=2(x+3)+x(x+3)=(x+3)(2+x)
2)2xˇ2+3x=0, x(2x+3)=0, x1=0,x2=-3/2
3)5abˇ2/abc=5b/c
4)(a+b)ˇ2-2ab+aˇ2-bˇ2=aˇ2+2ab+bˇ2-2ab+aˇ2-b2=2aˇ2=2.a.a=a.2a
5)xˇ3+2xˇ2-4x-8=0
xˇ2(x+2)-4(x+2)=0
(x+2)(xˇ2-4)=0
(x+2)(x+2)(x-2)=0
x1=-2,x2=-2,x3=2