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(x-1)(x+7)=xkwadrat+7x-x-7=xkwadrat+6x-7
3z(2+6z)= 6z+18zkwadrat
-2k+51+(2k-31)=-2k+51+2k-31=20
5c-(4d+2c)-d= 5c-4d-2c-d=3c-5d
4(-3x+2y-z)=-12x+8y-4z
zad.2.
5+(3-2x)=x-1
5+3-2x=x-1
-2x-x=-1-5-3
-3x=-9/:(-3)
x=3
-4(2+x)+x=6-x
-8-4x+x=6-x
-4x+x+x=6+8
-2x=14/:(-2)
x=-7
2+x=5-(3x_1)
2+x=5-3x+1
x+3x=-2+5+1
4x=4/:4
x=1
(x-1)(x+7)=x2+7x-x-7=x2+6x-7
3z(2+6z)=6z+18z2
-2k+51+(2k-31)=20
5c-(4d+2c)-d=3c-5d
4(-3x+2y-z)=-12x+8y-4z
2.
a)2+x=5-(3x-1)
2+x=-3x+6
4x=4/:4
x=1
b)
5+(3-2x)=x-1
9=3x/:3
x=3
c)
-4(2+x)+x=6-x
-8-4x+x=6-x
-14=2x/:2
x=-7
(x-1)(x+7)=x2+7x-x-7=x2+6x-7(x2 znaczy x kwadrat)
3z(2+6z)=6z+18z2
-2k+51+(2k-31)=-2k+51+2k-31=20
5c-(4d+2c)-d=5c-4d-2c-d=3c-5d
4(-3x+2y-z)=-12x+8y-4z
zad.2
2+x=5-(3x-1)
2+x=5-3x+1
x+3x=5-2+1
4x=4/:4
x=1
5+(3-2x)=x-1
5+3-2x=x-1
-2x-x=-1-5-3
-3x=-9/:(-3)
x=3
-4(2+x)+x=6-x
-8-4x+x=6-x
-4x+x+x=6+8
-2x=14/:(-2)
x=-7