I'm trying to solve the system:
x+y^2=4
x^2+y^2=16
I set the first equation to x=4-y^2 then substituted it in the 2nd equation to get,
(4-y^2)^2+y^2=16 which I open up to:
(4-y^2)(4-y^2)+y^2=16 now when I try to FOIL I get stuck on the -y^2*-y^2
16-8y^2 ???? +y^2=16
is -y^2*-y^2 = y^4 ? or am I doing theis whole equation wrong?
x+y^2=4
x^2+y^2=16
I set the first equation to x=4-y^2 then substituted it in the 2nd equation to get,
(4-y^2)^2+y^2=16 which I open up to:
(4-y^2)(4-y^2)+y^2=16 now when I try to FOIL I get stuck on the -y^2*-y^2
16-8y^2 ???? +y^2=16
is -y^2*-y^2 = y^4 ? or am I doing theis whole equation wrong?