book Maths Puzzle Numerical Ability

1.factor completely (5x^2+14x+13)^2-16((x^2+x-2)^2
2.factor out x^3+x^4y^4+y^6
3.a square has a perimeter of 12x+28cm.find its area.
4.a circle has a radius of 3x-5cm.find its a

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book Other Question

Perform the indicated operation; express answer in factored form:
(x + 5)2 � x2 + 6x + 8
2x2 � x � 6 x + 5 2 rockets are launched. the first one travels 9000mph. 15 minutes later the second is launched at 10000mph. What is the distance at which both rockets are an equal distance from earth.

Please help me set up the equation.

Thank you