Odpowiedź:
1.
y = - 3x² + 2x + 1
a = - 3 , b = 2 , c = 1
Δ = b² - 4ac = 2² - 4 * (- 3) * 1 = 4 + 12 = 16
2.
y=2x^2+3x+7
a = 2 , b = 3 , c = 7
Δ = b² - 4ac = 3² - 4 * 2 * 7 = 9 - 56 = - 47
3.
y=-4x^2+5x-2
a = - 4 , b = 5 , c = - 2
Δ = b² - 4ac = 5² - 4 * ( - 4) * (- 2) = 25 - 32 = - 7
4.
y=3x^2-2x+1/3
a = 3 , b = - 2 , c = 1/3
Δ = b² - 4ac = (- 2)² - 4 * 3 * 1/3 = 4 - 12/3 = 4 - 4 = 0
5.
y=-1/2 x^2+4x-5
a = - 1/2 , b = 4 , c = - 5
Δ = b² - 4ac = 4² - 4 * (- 1/2) * (- 5) = 16 - 10 = 6
6.
y=3/4 x^2-√2 x+1
a = 3/4 , b = - √2 , c = 1
Δ = b² - 4ac = (- √2)² - 4 * 3/4 * 1 = 2 - 3 = - 1
7.
y=4√2 x^2+3x
a = 4√2 , b = 3 , c = 0
Δ = b² - 4ac = 3² - 4 * 4√2 * 0 = 9 - 0 = 9
8.
y=6x^2+2
a = 6 , b = 0 , c = 2
Δ = b² - 4ac = 0² - 4 * 6 * 2 = 0 - 48 = - 48
9.
y=-6x^2+13x+5
a = 6 , b = 13 , c = 5
Δ = b² - 4ac = 13² - 4 * 6 * 5 = 169 - 120 = 49
10.
y=1/4 x^2-x/3+1/9
a = 1/4 , b = - 1/3 , c = 1/9
Δ = b² - 4ac = (- 1/3)² - 4 * 1/4 * 1/9 = 1/9 - 1/9 = 0
