Maths Exam

1. Solution of linear equations

We have the following equations: $$\begin{eqnarray} -3 x +2y &=& 4 \\ 3 x -5 y &=& 4 \end{eqnarray}$$
Correct Answer
$$ x=\frac{-28}{9}, y=\frac{-8}{3} $$

2. Differentiation A

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

3. Differentiation A

Differentiate the following equation: $$\left(-6 - x\right)\left(4 - x\right) + \sin\left(x + 4\right)$$
Correct Answer
$$(-\left(4 - x\right)) - \left(-6 - x\right) + \cos\left(x + 4\right)$$

4. Differentiation B

Differentiate the following equation: $$\ln\left(3 - x\right)\sin\left(\frac{(-x)}{6}\right)$$
Correct Answer
$$\frac{\frac{-6\sin\left(\frac{(-x)}{6}\right)}{3 - x} - \ln\left(3 - x\right)\cos\left(\frac{(-x)}{6}\right)}{6}$$

5. Integration

Please carry out the following integral: $$ \int {\left(-4x - 3\right)}^{2} dx$$
Correct Answer
$$ \frac{(-{\left(-4x - 3\right)}^{3})}{12} $$

6. Integration

Please carry out the following integral: $$ \int \sqrt{6x - 4} dx$$
Correct Answer
$$ \frac{{\left(6x - 4\right)}^{\frac{3}{2}}}{9} $$

7. Consider the following differential equation: $$ -3\frac{d^2y}{dx^2} - 3\frac{dy}{dx} + 6y = 0 $$

Find the general solution to the above equation.
Correct Answer
$$ A\exp\left(-2x\right) + B\exp\left(x\right) $$

8. Consider the following series: $$ \sum_{j=0}^{13} (-\left(j + 4\right)) $$

What does the sum evaluate to?
Correct Answer
$$ -147$$

9. Solution of linear equations

We have the following equations: $$\begin{eqnarray} -2 x +3y &=& 2 \\ -6 x +4y &=& 3 \end{eqnarray}$$
Correct Answer
$$ x=\frac{-1}{10}, y=\frac{3}{5} $$

10. Differentiation A

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


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