Odpowiedź :
Hej!
Przydatne wzory :
y = ax² + bx + c
Δ = b² - 4ac
a)
y = x² + 3x + 1
a = 1, b = 3, c = 1
Δ = 3² - 4 * 1 * 1 = 9 - 4 = 5
b)
y = 2x² + 4x
a = 2, b = 4, c = 0
Δ = 4² - 4 * 2 * 0 = 16 - 0 = 16
c)
y = -x² - 6
a = -1, b = 0, c = -6
Δ = 0² - 4 * (-1) * (-6) = -24
Pozdrawiam! - Julka
Odpowiedź:
[tex]a)\ \ y=x^2+3x+1\\\\a=1\ \ ,\ \ b=3\ \ ,\ \ c=1\\\\\Delta=b^2-4ac=3^2-4*1*1=9-4=5\\\\\\b)\ \ y=2x^2+4x\\\\a=2\ \ ,\ \ b=4\ \ ,\ \ c=0\\\\\Delta=b^2-4ac=4^2-4*2*0=16-0=16\\\\\\c)\ \ y=-x^2-6\\\\a=-1\ \ ,\ \ b=0\ \ ,\ \ c=-6\\\\\Delta=b^2-4ac=0^2-4*(-1)*(-6)=0-24=-24[/tex]