2у2+5у+2=0 х2-6х+5=0 х2-7х12=0

Question

2у2+5у+2=0 х2-6х+5=0 х2-7х12=0

Answer 1

X2-6x+5=0
-4x=-5
x=1,25

Answer 2

1)2y^2+5y+2=0 
Д=25-4*2*2=9 
x1,2=5+-3/2*2=5+-3/4 x1=2 x2=0.5
2) x^2-6x+5=0 
Д=36-4*5=16 
x1,2= 6+-4/2   x1=5 x2= 1
3) x^2-7x-12=0 
Д=49-12*4=1 
x1,2=7+-1/2 x1=4 x2=3