x^2+5*x+3=0
d = b^2 - 4ac = 5^2 - 4 × 1 + 3 = 25 - 12 = 13
x^2-5*x-3=0
d = b^2 - 4ac = 5^2 - 4 × 1 ×(- 3 ) = 25 + 12 = 37
x^2+5*x+3=0
d = b^2 - 4ac = 5^2 - 4 × 1 + 3 = 25 - 12 = 13
x^2-5*x-3=0
d = b^2 - 4ac = 5^2 - 4 × 1 ×(- 3 ) = 25 + 12 = 37