Question

va rog sa ma ajutati la E6

Answer 1

a)f(x)=5x²-6x-1
a=5, b=-6, c=-1
a mai mare ca zero, avem punct de minim local egal cu -Δ/4a
-Δ/4a=56/20=14/5
si x=-b/2a=6/10=3/5

b(f(x)=-3x²+9x
a=-3, b=9, c=0
a∠0, avem punct de maxim local, 
-Δ/4a=81/12=27/4
x=-b/2a=9/6=3/2

c)f(x)=-16x²+4
a=-16, b=0, c=4
a∠0, avem punct de maxim local, 
-Δ/4a=256/64=4
x=-b/2a=0

d)f(x)=3x²+1
a=3, b=0, c=1
a mai mare ca 0, avem un minim local
-Δ/4a=12/12=1
x=-b/2a=0