x² + y² = (x + y)² - 2xy = 3² - 2* 4= 9 - 8 = 1
16x^{2}+2x-3=8x-2
16x^{2} -6x-1=0
D=36+64=100
x1=(6+10)/32=0.5
x2=(6-10)/32=-1/8