Question

Sa se rezolve ecuatiile

3x²-x-10=0,
-3x²-5x+12=0
9x²-12x+4=0
20x-4-25x² =0
-10x²+4x-10=0​

Answer 1

Răspuns:

Explicație pas cu pas:

a)x1.2=1+/-√1+120/6    x1=1+11/6=12/6=2     x2=1-11/6=-5/3

b) x1.2=5+/-√25+144/6      x1=5+13/6=18/6=3     x2=5-13/6=-4/3

c)x1,2=12+/-√144-9×16/18      x1,2=12/18=2/3

d)-25x²+20x-4=0

x1,2=-10+/-√100-100/25       x1,2=-10/15=-2/5

e) 5x²-2x+5=0       x1,2=1+/-√1-25/5    Δ<0     nu are solutii reale