Ax2 + bx + c = 0
D = b2 – 4ac
ա) 2x2 + 5 +3 = 0
D = 25 – 4 × 2 3 = 0
D= 25-4 × 2 3 = 4 × 2
3 = 25-24 =1
D=1
Բ) 2x2 + 5x – 3 =0
D= 25 – 4 × 2 3 = 0
D= 25 – 4 × 2 3 = 25 – 4 × 2
3 = 25 – 24 = 1
D = 1
Գ) 2x2 + 5x -3 =0
D= 25 – 4 × 2 (-3) = 0
D= 25 – (-24) = 49
D= 49
Դ) 2x2 + 5x — 3 = 0
D= 25 – 4 × 2 (-3) = 0
D= 25 – 4 × 2 (- 3) = 0
D= 25 – 4 × 2 (-3) = 25 – (-24 ) = 49
D= 49