Question

Complete the square.
2x^2-y^2+8x+4y+3=0

Answer 1

is it 2(x+2)^2 - (y-2)^2 = 9 ?

Answer 2

to complete the square, rewrite the expression as
(2x^2 + 8x) - (y^2 - 4y) + 3
2(x^2 + 4x ) - (y^2 - 4y) + 3
2(x^2 +4x + 4 - 4) - (y^2 - 4y + 4 - 4) + 3

can you proceed now?

Answer 3

seems right shouldn`t be 9 on the RHS