Question

已知：4乘以x的平方+y的平方-4x+10y+26=0,求12x+y的算术平方根

Answer 1

(4x^2-4x+1)+(y^2+10y+25)=0

(2x-1)^2+(y+5)^2=0

2x-1=0,y+5=0

x=1/2,y=-5.

12x+y=12*1/2-5=1

12x+y的算术平方根1.