book Maths Puzzle Numerical Ability

A rectangle has a diagonal whose length is x. The rectangle is twice as long as it is wide. What is the area of the rectangle in terms of x?

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book Other Question

factor the following:

4x2 - 39x + 27

the 4x is squared

I am not sure if this is factorable or not
what is the absolute value for this problem? 2r + 9 > 19 The 2r + 9 is in absolute equations marks, my computer does not have those symbols.