1) 9х^2+6х+1=х^2-4х+4
9х^2+6х+1-х^2+4х-4=0
8х^2+10х-3=0
D=10^2-4*8*(-3)=100+96=196=14^2
X1=(-10-14)/16=-24/16=-1,5
X2=(-10+14)/16=4/16=1/4=0,25
2) 4-4x+x^2=25x^2+10x+1
X^2-4x+4-25x^2-10x-1=0
-24x^2-14x+3=0
24x^2+14x-3=0
D=14^2-4*24*(-3)=196+288=484=22^2
X1=(-14-22)/48=-36/48=-0,75
X2=(-14+22)/48=8/48=1/6