Question

4. 49x2=100
l.
x² - 9x + 20-0
2. X? 2x + 3550
3.5x² 25x=0

repede varog​

Answer 1

Răspuns:

1.49x² =100=> x²=radical din 100/49 =>x=10/49=>x=Plus minus 10/49

2. x²-9x+20=0=>D =b²-4ac=81-80=1

x¹ =-b+radical din D /2a=9+1/2=5

x²=9-1/2=4

3.5x²+25x=0=>x(5x+25)=0=>x=0

=>5x+25=0=>5x=-25=>x=-5