(a) Expand and simplify \(x(x+3)+4x(x-1)\). [2]

(b) Simplify \((3x^3)^3\). [2]

(c)(i) Factorise completely \(7x^7+14x^{14}\). [2]

(c)(ii) Factorise \(xy+xw+2ay+2aw\). [2]

(c)(iii) Factorise \(4x^2-49\). [1]

(d) Solve \(2x^2+5x+1=0\) with full working, to 2 decimal places. [4]