Question

Решите систему уравнений
х^2+4y^2=25
3 х^2+12у^2=25х

Answer 1

Х^2 + 4y^2 = 25
4y^2 = 25 - x^2
3x^2 + 3( 25 - x^2 ) = 25x
3x^2 + 75 - 3x^2 - 25x = 0
- 25x = - 75
x = 3
4y^2 = 25 - x^2
4y^2 = 25 - 9
y^2 = 16 : 4
y^2 = 4
Ответ ( 3 ; 2 ) ; ( 3 ; - 2 )

Answer 2

Pervoe i vtoroe zadanie na fotografii.