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a) x²=2x
x²-2x=0
x(x-2)=0
x=0 v x-2=0
x=0 v x=2
b)
x²=-9x
x²+9x=0
x(x+9)=0
x=0 v x+9=0
x=0 v x=-9
c)
2x²=7x
2x²-7x=0
x(2x-7)=0
x=0 v 2x-7=0
x=0 v 2x=7
x=0v x=3,5
d)
2/3x²=2x /:2
1/3x²=-x /*3
x²=-3x
x²+3x=0
x(x+3)=0
x=0 v x+3=0
x=0 v x=-3
e)
6x=-4x²
6x+4x²=0 /:2
3x+2x²=0
x(3+2x)=0
x=0 v 3+2x=0
x=0v 2x=-3
x=0 v x=-1,5
f)
4x=√2x²
4x-√2x²=0
x(4-√2x)=0
x=0 v 4-√2x=0
x=0 v √2x=4
x=0 v x=4/√2
x=0 v x=4√2/2
x=0 v x=2√2
2zad.
a)
x²+9=6x
x²-6x+9=0
(x-3)²=0
x-3=0
x=3
b)
4x²+9=12x
4x²-12x+9=0
(2x-3)²=0
2x-3=0
2x=3
x=1,5
c)
16x²=1
16x²-1=0
(4x-1)(4x+1)=0
4x-1=0 v 4x+1=0
4x=1 v 4x=-1
x=0,25 v x=-0,25
d)
25x²=9
25x²-9=0
(5x-3)(5x+3)=0
5x-3=0 v 5x+3=0
5x=3 v 5x=-3
x=0,6 v x=-0,6
e)
2x²=1
2x²-1=0
(√2x-1)(√2x+1)=0
√2x-1=0 v √2x+1=0
√2x=1 v √2x=-1
x=1/√2 v x-1/√2
x=√2/2 v x=-√2/2
f)
9x²=6 /:3
3x²=2
3x²-2=0
(√3x-√2)(√3x+√2)=0
√3x-√2=0 v √3x+√2=0
√3x=√2 v √3x=-√2
x=√2/√3 v x=-√2/√3
x=√6/3 v x=-√6/3
3zad
a)
(x-3)(x-6)=0
x-3=0 v x-6=0
x=3 v x=6
b)
(x-4)(x+2)=0
x-4=0 v x+2=0
x=4v x=-2
c)
(x+3)(2x+8)=0
x+3=0 v 2x+8=0
x=-3 v 2x=-8
x=-3 v x=-4
d)
(2x-1)(4x-1)=0
2x-1=0 v 4x-1=0
2x=1 v 4x=1
x=0,5 v x=0,25
e)
(3x+5)(4x-3)=0
3x+5=0 v 4x-3=0
3x=-5 v 4x=3
x=-5/3 v x=0,75
f)
(6x+9)(9x+6)=0 /:3
(2x+3)(3x+2)=0
2x+3=0 v 3x+2=0
2x=-3 v 3x=-2
x=-1,5 v x=-2/3
Mam nadzieje, że nie strzeliłem nigdzie gafy :)