Question

plssss doar punctele a,b,c dauu coroanaa​

Answer 1

Răspuns:

Explicație pas cu pas:

a)x²-8x+12=0      

x=-b/2a=8/2=4  

-Δ/4a=8²-4·12=(64-48)/4=16/4=-4

sau

f'(x)=2x+8      f'=0   ⇒x=4   ⇒f(4)=4²-8·4+12=16-32+12=-4

b)x²-6x+2=0  

x=6/2=3

-Δ/4a=-(36-4·2)/4=-28/4=-7

sau f'(x)=2x-6   ⇒xm=3      ⇒f(3)=9-18+2=-7

c)x²+3x-1=0  

xm=-b/2a=-3/2

-Δ/4a=-(9+4)/4=-13/4

sau f'=2x+3   ⇒xm=-3/2       f(-3/2)=9/4+3(-3/2)-1=9/4-9/2-1=(9-18-4)/4=-13/4