L6FM Hwk 3 Due Mon 26.9.16

Total: 26 marks. Show all working out. Those not showing mathematical rigour will be penalised.

PRINT OUT FOR YOUR RECORDS

1. Write in the from $a(x+b)^2 + c$
   i.e. complete the square: \[2x^2-5x-3\]

   [3 marks]

2. Simplify \[ \frac{2}{x^2-3x-10} - \frac{3}{x^2-25} \]

   [4 marks]

3. Simplify as far as possible: \[ \frac{15}{\sqrt {3}} - \frac{11}{2\sqrt{7} + 3\sqrt{3}} \]

   [4 marks]

4. Solve $-3-4x-5x^2>0$ showing how you arrived at your answer.

   [3 marks]

5. \[ f(x)=\frac{2\sqrt x-x^2}{3x\sqrt x} \]
   1. Find the equation of the tangent at $x=4$, giving your answer in the form $ax+by+c=0$ where a,b,c are integers

      [5 marks]

   2. Find the equation of the normal at $x=4$, giving your answer in the form $ax+by+c=0$ where a,b,c are integers

      [4 marks]

   3. Find $f''(4)$

      [3 marks]

L6FM Homework 2 Due Mon 19.9.16

Total: 20 marks. Show all working out. Those not showing mathematical rigour will be penalised.

PRINT OUT FOR YOUR RECORDS

1. Write in the from $a(x+b)^2 + c$
   i.e. complete the square: \[3x^2-7x-20\]

   [3 marks]

2. Simplify \[ \frac{3}{x^2-5x +4} - \frac{5}{x^2-16} \]

   [4 marks]

3. Simplify as far as possible: \[ \frac{15}{\sqrt {5}} - \frac{46}{2\sqrt{7} - \sqrt{5}} \]

   [4 marks]

4. Solve $6x^2+x-12>0$

   [3 marks]

5. Solve $5+x+x^2>0$

   [3 marks]

6. Solve \[ x^2 = 4+5xy \\ x=5y +1 \]

   [3 marks]

L6 FM Homework

Total: 10 marks. Show all working out. Those not showing mathematical rigour will be penalised.

1. Factorise fully $6x^2-7x-20$

   [2 marks]

2. Simplify as far as possible: \[ \frac{8}{4^{5x-1}}=\sqrt{32^{3+x}} \]

   [4 marks]

3. Simplify as far as possible: \[ \frac{26}{\sqrt {13}} - \frac{8}{\sqrt{13} - \sqrt{11}} \]

   [4 marks]