TÌM X

TÌM X: c) (x+4)2 + (x + 6)2+2(1-x)(1+x) = 0
d) (3-5x)(3+5x)+(5x+1)2 = 7
e) x² - 12 x + 48 = 0
g) x2+5x+4=0
h) 4x2+5x+1=0