rozwiąż równania
a)(x-9)(x-5)=Xdo kwadratu+56-14x
b)xkwadrat-(x+3)(x+4)=x+20
c)(x-1)(x+1)-x(x+2)-1=2(x+1)
d)4(x+2)do kwadratu=(2x-1)(2x+1)-2(2x-1)
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a)
x²-5x-9x+45=x²+56-14x
-14x+45=-14x+56
45≠56
równanie sprzeczne
b)
x²-(x²+4x+3x+12)=x+20
x²-x²-7x-12=x+20
-7x-12=x+20
8x=-32
x=-4
c)
x²+x-x-1-x²-2x-1=2x+2
-2x-2=2x+2
4x=-4
x=-1
d)
4(x²+4+4x)=4x²+2x-2x-1-4x+2
4x²+16x+16=4x²-4x+1
16x+16=-4x+1
20x=-15
x=-0,75
a)(x-9)(x-5) = +56-14x
+5x-9x+45 = +56-14x
-+5x-9x+14x = 56-45
10x = 11 |: 10
x = 11/10
b) -(x+3)(x+4) = x+20
+(-x-3)(x+4) = x+20
- -4x-3x-12 = x+12
-4x-3x-x = 12+12
-8x = 24 |:(-8)
x = -3
c) (x-1)(x+1)-x(x+2)-1=2(x+1)
+x-x-1--2x-1 = 2x+2
x-x-2x-2x = 2+1+1
-4x = 4 |:(-4)
x = -1
d)4(x+2)do kwadratu = (2x-1)(2x+1)-2(2x-1)
4*+4x+4 = 4-1-4x+2
4-4+4x+4x = -1+2-4
8x = -3 |:(-8)
x = 3/8