Svar:
# "vertex" = (- 20/3, -137 / 3) #
Forklaring:
# "givet en parabola i" farve (blå) "standardformular" #
# • farve (hvid) (x) y = ax ^ 2 + bx + c farve (hvid) (x); a! = 0 #
# "så er krydsets x-koordinat" #
# • farve (hvid) (x) x_ (farve (rød) "toppunkt") = - b / (2a) #
# y = 3 / 2x ^ 2 + 20x + 21 "er i standardformular" #
# "med" a = 3/2, b = 20 "og" c = 21 #
#x _ ("toppunkt") = - 20/3 #
# "erstat denne værdi i ligningen for y-koordinat" #
#Y _ ("toppunkt") = 3/2 (-20/3) ^ 2 + 20 (-20/3) + 21 #
#COLOR (hvid) (xxxx) = 200 / 3-400 / 3 + 63/3 = -137 / 3 #
#color (magenta) "vertex" = (- 20/3, -137 / 3) #
