Question

х²=4х
n²=11n-10
решите плиз ​

Answer 1

х²=4х

x²-4x=0

x(x-4)=0

x1=0

x-4=0

x2=4

n²=11n-10

n²-11n+10=0

D= 121-4×10= 121-40= 81 (+9)

n1, n2= (11+9)/2= 10; 1