book Maths Puzzle Numerical Ability

I need a help.

Use the method of "Completing the Square" to solve the following quadratic equations:

3x(x-1)=4

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book Other Question

Two Questions:

821,582 is what percent of 1,599,441?

and

1,191,763 is what percent of 2,362,726?
Dear Sir

We need to work out the area of a chord. Is there an equation for this - I am presuming pi is used somewhere? Any help would be gratefully appreciated.

With kind