Question

x^2/16+y^2/4=1 надо выразить у(игрик)

Answer 1

x^2/16+y^2/4=1|*16

x^2+4y^2=16

4y^2=16-x^2

y^2=(16-x^2):4

y=+-sqr((16-x^2):4)

y=+-sqr(16-x^2):2

y=+-sqr((4-x)(4+x)):2

 

Answer 2

1)y^2/4=1-x^2/16 2)y^2=(1-x^2/16)*4 3)y1=sqrt((1-x^2/16)*4) 4)y2=-sqrt((1-x^2/16)*4)