Odpowiedź:
-7x²+56x=0
x(-7x+56)=0
x=0 v -7x+56=0
-7x= -56 /:(-7)
x= 8
(x-6)(2x+8)=0
x-6=0 v 2x+8=0
x=6 2x= -8 /: 2
x= -4
100x²-16=0
(10x+4)(10x-4)= 0
10x+4=0 v 10x-4=0
10x= -4 /:10 10x= 4 /:10
x= -4/10= -2/5 x= 4/10=2/5
(2x+3)²= (x-3)²
4x²+12x+9= x²-6x+9
4x²-x²+12x+6x+9-9=0
3x²+18x=0
3x(x+6)=0
3x=0 v x+6=0
x²=0 x= -6
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Odpowiedź:
-7x²+56x=0
x(-7x+56)=0
x=0 v -7x+56=0
-7x= -56 /:(-7)
x= 8
(x-6)(2x+8)=0
x-6=0 v 2x+8=0
x=6 2x= -8 /: 2
x= -4
100x²-16=0
(10x+4)(10x-4)= 0
10x+4=0 v 10x-4=0
10x= -4 /:10 10x= 4 /:10
x= -4/10= -2/5 x= 4/10=2/5
(2x+3)²= (x-3)²
4x²+12x+9= x²-6x+9
4x²-x²+12x+6x+9-9=0
3x²+18x=0
3x(x+6)=0
3x=0 v x+6=0
x²=0 x= -6
Szczegółowe wyjaśnienie: