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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please help me solve the following quadratic equations by factorisation;
1.3x^2+11x-4=0
2.x^2+5x-6=0
3.4x^2+14x+6=0
4.3x^2-5x-2=0
5.3x^2-5x+2=0
6.5x^2-14x-3=0 please help me step by step on how to graph the equation:

-2x+5y=-10

Thank you