Find the equaion of the parabola having its vertex at the origin , its axis as indicated :

A ) x-axis : (-4, - 20 )

b) y - axis : (30,-15 )

C) y - axis : (-root2,3)

my answer

A )

we have (-4, - 20 ) that mean the focus ( - 20 , 0 )

now we do comper 4ay = - 20

= -5

then the equation is : y2 = 4ax

= y2 =4(-5) x

=y2 = -20 x

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I sove only number one beacuse i am not sure from my answer

help me Are this solving it corect ?