Question

ajutatima va rog imi trebuie urgent exercițiul 4

Answer 1

5x^2+0,2x=0
25x+0,2x=0
25,2x=0
x=0:25,2
x=0

5x^2-6x+1=0
19x+1=0
19x=0-1
19x=-1
x=-1:19
x=0,05

Answer 2

b)5x²-6x+1=0
a=5
b=-6
c=1
d = b²-4×a×c⇒
(-6)²-4×5×1=
36-20=
16
√d=√16⇒d=4
x1x2=-b+-√d/2a
x1=-6-4/2×5⇒-10/10⇒x1=-1
x2=-6+4/10⇒-2/10⇒x2=-1/5

c)3x(3x-2)+7=6⇒
9x²-6x+7-6=0⇒
9x²-6x+1=0⇒
a=9
b=-6
c=1
d=b²-4ac
d=(-6)²-4×9×1⇒
d=36-36⇒d=0⇒√d=√0⇒d=0⇒
x1x2=-b+-√d/2a⇒
x1=6+0/18⇒6/18⇒x1=3/6⇒1/2
x2=6-0/18⇒6/18⇒x2=3/6⇒1/2
succes