Question

х2 – 12х + 11 = 0;
-2у2 + 9y - 10 = 0​

Answer 1

Объяснение:

x^2 -12x +11=0

D= ( -12) - 4* 11=144 -44 =100

x1= ( 12 - \|100)/ 2*1= (12-10)/2= 2/2=1

x2= ( 12 + \|100)/ 2*1= (12+10)/2= 22/2=11

ответь ( 1 ; 11)

-2y^2 +9y -10=0 | *( -1)

2y^2 -9y +10= 0

D = (-9)^2 - 4*2*10= 81 - 80=1

y1= ( 9 - 1)/ 2*2= 8/4 = 2

y2 = ( 9 +1)/4= 10/4= 5/2= 2,5

ответь ( 2 ; 2,5)