book Maths Puzzle Numerical Ability

x^4 -3x^2-4=0

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book Other Question

A ROOM MEASURES 3M BY 4M BY 7M.
THE WALLS NEED 2 COATS OF PAINT. A 4-L CAN OF PAINT COVERS 40M SQUARED.
HOW MUCH PAINT SHOULD TANYA BUY?
I KNOW THE ANSWER BUT NOT HOW I GOT IT.
How do you identify the location(axis or quadrant) of each point listed?

( Example = 2,-2 is in Quatrant IV 2,0 is on the X axis.