book Maths Puzzle Numerical Ability Algebra

PLEASE HELP ME FACTOR AND UNDERSTAND THIS 5X^2-30X+40

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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
i have this equation for hw but i dont know how to solve it can u help me please? its



x
- +2=4
2