Question

If x 2 + y2=25, and y=2x, find x.

Answer 1

Answer:

x^2 +y^2 =25

x^2 +2x^2=25

3x^2=25

3x=√ 25

3x=5

x= 5/3

Answer 2

Step-by-step explanation:

x2 + y2=25

x^2+4x=25

let's solve this quadratic equation

x^2+4x-25=0

comparing to ax^2+bx+c=0

a=1,b=4,c=-25

b^2-4ac=-400

since b^2-4ac =-400

roots are imaginary

hope it helps mark me as brainliest