D=b²-4ac=22²-4*7*3 = 484-84 = 400
x1 = (-b + √D)/2a = (22+20)/14 = 3
x2 = (-b - √D)/2a = (22-20)/14 = 2/14 = 1/7
D=(-22)²-4×7×3=484-84=400
x1= 22-20/7×2=1/7
x2=22+22/7×2=22/7
D=b²-4ac=22²-4*7*3 = 484-84 = 400
x1 = (-b + √D)/2a = (22+20)/14 = 3
x2 = (-b - √D)/2a = (22-20)/14 = 2/14 = 1/7
D=(-22)²-4×7×3=484-84=400
x1= 22-20/7×2=1/7
x2=22+22/7×2=22/7