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25x^2+20x-20x+4=0
25x^2+4=0
25x^2=-4
sprzeczne
b)(2x-1)(x+2)=3x-2
2x^2+4x-x-2-3x+2=0
2x^2=0
x=0
c)(1-3x)²=1-6x
1-6x+9x^2-1+6x=0
9x^2=0
x=0
d(3+2x)²=(3x+2)²+10
9+12x+4x^2=9x^2+12x+14
5x^2=-5
x^2=-1
sprzeczne
e)(5x-2)(3-x)=-6(1-x)(1+x)
15x-5x^2-6+2x=-6+6x^2
11x^2-17x=0
x(11x-17)=0
x=0 lub x= 17/11
f)x+9=(x-3)²
x+9=x^2-6x+9
x^2-7x=0
x(x-7)=0
x=0 lub x=7
g)(4x-6)²=(x-4)(x-9)
16x^2-48x+36=x^2-9x-4x+36
15x^2-35x=0
5x(3x-7)=0
x=0 lub x=7/3