Hello, cyy!
Subtract [2] from [1]: .
Factor: .
Factor: .
Factor: . . . Ah! I see that you already did this!
And we have two equations to solve . . .
. . Substitute into [1]: .
. . And we have: .
. . Substitute into [1]: .
. . which simplifies to: . .which has no real roots.
Therefore: .