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x2 - 2x2 = -6-4
6+4=x2
x2=10
b) 5-x2=x2+3
5-3=2x2
2=2x2 /:2
1=x2
c) x2=(1-x)(1+x)
x2=1-x2
2x2=1
x2= 1/2
d)(2x+3x)(kwadrat)+(x-3)2=25x2+2x-6
4+6=2x2-x2
10=x2
x= pierwiastek z 10
b)5-x2=x2+3
5-3=x2+x2
2=2x2
x2=1
x=1 lub x=-1
c)x2=(1-x)(1+x)
x2= 1-x2 (wzór skróconego mnożenia)
-1=-2x2
x2=1/2
x= pierwiastek z 1/2
d)(2x+3x)(kwadrat)+(x-3)2
4x2+12x2+9x2+2x-6=25x2+2x-6