Maths Exam

1. Solution of linear equations

We have the following equations: $$\begin{eqnarray} -2 x -y &=& 1 \\ 2 x +5y &=& 3 \end{eqnarray}$$
Correct Answer
$$ x=-1, y=1 $$

2. Differentiation A

Differentiate the following equation: $$\exp\left(\sin\left({x}^{2}\right)\right)$$
Correct Answer
$$2\exp\left(\sin\left({x}^{2}\right)\right)\cos\left({x}^{2}\right)x$$

3. Differentiation A

Differentiate the following equation: $$\sin\left(\ln\left(5x\right)\right)$$
Correct Answer
$$\frac{\cos\left(\ln\left(5x\right)\right)}{x}$$

4. Differentiation B

Differentiate the following equation: $$\left(-3x + \cos\left(x\right)\right)\ln\left(2x\right)$$
Correct Answer
$$\left(-3 - \sin\left(x\right)\right)\ln\left(2x\right) + \frac{-3x + \cos\left(x\right)}{x}$$

5. Integration

Please carry out the following integral: $$ \int \sqrt{-5x} dx$$
Correct Answer
$$ \frac{-2{\left((-5)x\right)}^{\frac{3}{2}}}{15} $$

6. Integration

Please carry out the following integral: $$ \int {\left(x - 2\right)}^{4} dx$$
Correct Answer
$$ \frac{{\left(x - 2\right)}^{5}}{5} $$

7. Consider the following differential equation: $$ -5\frac{d^2y}{dx^2} + 6\frac{dy}{dx} - y = 0 $$

Find the general solution to the above equation.
Correct Answer
$$ A\exp\left(\frac{x}{5}\right) + B\exp\left(x\right) $$

8. Consider the following series: $$ \sum_{j=0}^{11} -3\left(j + 6\right) $$

What does the sum evaluate to?
Correct Answer
$$ -414$$

9. Solution of linear equations

We have the following equations: $$\begin{eqnarray} 5 x +y &=& 1 \\ -6 x -y &=& 1 \end{eqnarray}$$
Correct Answer
$$ x=-2, y=11 $$

10. Differentiation A

Differentiate the following equation: $$\frac{6\left(6 - x\right)}{x} + \sqrt{{x}^{-6}}$$
Correct Answer
$$\frac{-6}{x} - \frac{6\left(6 - x\right)}{{x}^{2}} + \frac{-3}{{x}^{4}}$$


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