Svar:
Find toppunkt af #y = 7x ^ 2 + 5x - 11 #
Vertex #(-5/14, 1981/146)#
Forklaring:
x-koordinat af vertex: #x = (-b) / 2a = -5 / 14 #
y-koordinat af vertex:
#y = y (-5/14) = 7 (25/196) + 5 (-5/14) - 11 = = 175/196 - 25/14 - 11 = 1981/196 #
Vertex form: #y = 7 (x + 5/14) ^ 2 + 1981/196 #
