VA ROG MULT....puteti sa ma ajutati?
Răspunsuri la întrebare
Răspuns:
Explicație pas cu pas:
1. a=1 b=6 c=8 delta=4 , sol.2 x1=2, x2=4
2. a= -3 b=2 c= -5 delta= -54 sol.0 , nu are soluti in R
3. a=25 b= 10 c=1 delta=0 sol.1 , x1=x2= -1/5
4. a=1 b=1 c=1/4 delta=0 sol.1 x1=x2= -1/2
5. a=2 b=3 c=4 delta= -23 sol.0 , nu are solutii in R
6. a=7 b= -1 c= -6 delta=169 sol.2 x1=-6/7 x2=1
7. a= -1 b= -1 c=2 delta=9 sol.2 x1= -2 x2=1
1. 15x^2-22x+8=0
/_\= 484-480=4
x1 = -(-22) - sqrt(4) /2*15= 22-2/30=20/30=2/3
x2= -(-22) + sqrt(4) / 2*15= 22+2/30=24/30=4/5
2. 1.5x^2 - 2.2x +0.8=0
/_\= 4.84 - 4.8 = 0.4
x1 = -(-2.2) - sqrt(0.4)/2*1.5= 2.2-sqrt(0.4)/3
x2 = -(-2.2) + ssqrt(0.4)/2*1.5= 2.2+sqrt(0.4)/3
3. 150x^2 - 220x + 80=0
/_\= 48400-48000= 400
x1 = -(-220) - sqrt(400) / 2*150= 220-20/300=200/300=2/3
x2= -(-220) - sqrt(400)/2*150= 220+20/300=240/300=4/5