exam Maths Puzzle Numerical Ability

How do you put 2n^2-4n-6=0 in to a graph or table . Round to the nearst tenth

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exam Other Question

1. ac - bc + ad - bd

2. xy - 3x - 8y + 24

3. 4x2 + 20x + 5y +xy

4. 48x2y + 20xz +12xy + 5z I am stuck on correct answer for:

(3 X 10^2) X (2 X 10-3)=:

The 10-3 is actually (10 to negative 3rd power) but I can't show that correctly in email.

I am not using a spec