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

I need to multiply this, cant seem to work it out. Please help me

(5√[2] + 3)(√[2] - 2√[3]) 1.find the volume of a rectangular solid 15.7 cm by 2 cm by 3cm

2. find the volume of a cylinder whose base has a diameter of 14ft & whose height is 23 ft

3. volume of a square pyramid whose side is 12 cm & whose height is 12cm