9000146706
Level:
A
Expand the following polynomial.
\[
(2x + 3)^{2} - (2 - x)^{2}
\]
\(3x^{2} + 16x + 5\)
\(3x^{2} + 8x + 13\)
\(3x^{2} + 13\)
\(3x^{2} + 5\)
A
9000150101
Level:
A
Evaluate the following integral on \(\mathbb{R}\).
\[
\int \left (\cos x -\sin x\right )\, \mathrm{d}x
\]
\(\sin x +\cos x + c,\ c\in \mathbb{R}\)
\(\sin x -\cos x + c,\ c\in \mathbb{R}\)
\(-\sin x +\cos x + c,\ c\in \mathbb{R}\)
\(-\sin x -\cos x + c,\ c\in \mathbb{R}\)
9000148902
Level:
A
There are four paths from a city to the top of nearby mountain. Find the number of
possible treks from the city to the mountain and back, if it is required to use one
path up and another one down.
\(4\cdot 3=12\)
\(4\cdot 4=16\)
\(4 + 3=7\)
\(2\cdot 4=8\)
9000150103
Level:
A
Evaluate the following integral on the interval \(\left(-\frac{\pi}2;\frac{\pi}2\right)\).
\[
\int \left ( \frac{3}
{\cos ^{2}x} - 3\mathrm{e}^{x}\right )\, \mathrm{d}x
\]
\(3\mathop{\mathrm{tg}}\nolimits x - 3\mathrm{e}^{x} + c,\ c\in \mathbb{R}\)
\(- 3\mathop{\mathrm{tg}}\nolimits x - 3\mathrm{e}^{x} + c,\ c\in \mathbb{R}\)
\(- 3\mathop{\mathrm{tg}}\nolimits x + 3\mathrm{e}^{x} + c,\ c\in \mathbb{R}\)
\(3\mathop{\mathrm{tg}}\nolimits x + 3\mathrm{e}^{x} + c,\ c\in \mathbb{R}\)
9000148909
Level:
A
There are \(24\)
girls and \(8\)
boys in the class. How many ways are there to designate a president and vice-president
of the class if it is required that one of the position will be held by a boy and the
other one by a girl?
\(24\cdot 8\cdot 2=384\)
\(24\cdot 8=192\)
\(\frac{32!}
{2!\; 30!}=496\)
\(\frac{32!}
{24!\; 8!}=10\:518\:300\)
9000141910
Level:
A
Given the function \(h\),
find \(\lim _{x\to -\infty }h(x)\).
\[
h(x)=\begin{cases}
-\frac1{x-1} & \text{if } x< 1,\\
-(x-1)^2+2 & \text{if } x\geq 1
\end{cases}
\]
\(0\)
\(2\)
\(\infty \)
\(-\infty \)
Does not exist
9000146701
Level:
A
Expand the following polynomial.
\[
2 - (2x + 1) + x(5 - 2x) - 3(x - 2)
\]
\(- 2x^{2} + 7\)
\(- 2x^{2} + 9\)
\(- 2x^{2} - 3\)
\(- 2x^{2} - 5\)
9000146702
Level:
A
Expand the following expression.
\[
a - 4(2 - a) - a(5a + 1) + 2a(3 - 2a)
\]
\(- 9a^{2} + 10a - 8\)
\(- 9a^{2} + 12a - 8\)
\(- 9a^{2} + 2a - 8\)
\(- 9a^{2} + 4a - 8\)
9000146203
Level:
A
Expand the following expression.
\[
\left (x^{5} -\sqrt{2}y\right )^{2}
\]
\(x^{10} - 2\sqrt{2}x^{5}y + 2y^{2}\)
\(x^{10} -\sqrt{2}x^{5}y + 2y^{2}\)
\(x^{10} - 2\sqrt{2}x^{5}y - 2y^{2}\)
\(x^{10} -\sqrt{2}x^{5}y - 2y^{2}\)
9000146204
Level:
A
Expand the following expression.
\[
\left (\frac{a}
{2} + 4b^{3}\right )^{2}
\]
\(\frac{a^{2}}
{4} + 4ab^{3} + 16b^{6}\)
\(\frac{a^{2}}
{4} + 2ab^{3} + 16b^{6}\)
\(\frac{a^{2}}
{4} + 4ab^{3} + 16b^{5}\)
\(\frac{a^{2}}
{4} + 2ab^{3} + 16b^{5}\)