4 - 4x^2 = 0
16x^2 + 22x =38
7b+ b^2 = 0
X^2 = 30 + x

4-4х^2=0
-4х^2=-4
х^2=1
х=1

16х^2+22х=38
16х^2+22х+38=0
Д=22^2-4×16×38=484-2432=-1948,корней нет

х^2=30+х
х^2-х-30=0
Д=(-1)^2-4×(-30)=1+120=121
х1=(1+11)/2=6
х2=(1-11)/2=-5