How do I prove this?

How do I prove this?

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wolframalpha.com/input/?i=(a d + b c + b d)^2 - 4 a b c d > 0
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analytically

What does that mean?

It's false

How do you know?

where are the proofs?

Move 4abcd to the other side of the inequality, take sqare root of both sides. This should immediately look like a familiar inequality, with minor complications.

Why don't you just do the proof? What you said makes little sense.

let them all equal 1 lol

It's false, consider

a = -2b, -c/12 < d < 0