9000020407
Level:
A
In the following list identify an equation with real solution.
\(- 0.5x^{2} + 2x + 3 = 0\)
\(- x^{2} + 4x - 5 = 0\)
\(2x^{2} - 3x + 3 = 0\)
\(x^{2} - x + 1 = 0\)
Quadratic Equations and Inequalities
9000020408
Level:
A
Which of the given equations have at least one root the same?
\[ \begin{aligned}
x^{2} + 8x + 15 & = 0 &\text{(1)}
\\x^{2} - 8x + 15 & = 0 &\text{(2)}
\\x^{2} +\phantom{ 8}x - 12 & = 0 &\text{(3)}
\\x^{2} - 2x -\phantom{ 1}8 & = 0 &\text{(4)}
\\\end{aligned}\]
equations (2) and (3)
equations (1) and (3)
equations (2) and (4)
Such a pair does not exist.
9000022301
Level:
B
Find the solution set of the quadratic inequality.
\[
x^{2} - 8x + 16\leq 0
\]
\(\{4\}\)
\(\emptyset \)
\(\mathbb{R}\setminus \{4\}\)
\(\mathbb{R}\)
\((-\infty ;4)\cup (4;\infty )\)
9000021703
Level:
B
Solve the following inequality.
\[
(x - 2)^{2}\geq (x + 1)(x - 5)
\]
\(x\in \mathbb{R}\)
\(x\in \emptyset \)
\(x\in \left (-\infty ; \frac{9}
{8}\right ] \)
\(x\in \left [ \frac{9}
{8};\infty \right )\)
9000021803
Level:
B
Solve the following inequality.
\[
(3x - 1)(2 - 4x) < 0
\]
\(x\in \left (-\infty ; \frac{1}
{3}\right )\cup \left (\frac{1}
{2};\infty \right )\)
\(x\in \left (\frac{1}
{3}; \frac{1}
{2}\right )\)
\(x\in \left (-\infty ; \frac{1}
{2}\right )\)
\(x\in \left (\frac{1}
{3};\infty \right )\)
9000020404
Level:
A
Find a number which is a sum of one half of the bigger solution of
\[
x^{2} - 10x + 24 = 0
\]
and a double of the smaller solution of
\[
-x^{2} + 10x - 16 = 0.
\]
\(7\)
\(12\)
\(6\)
\(14\)
9000020909
Level:
B
The sum of squares of two consecutive integers is
\(1201\).
Identify these integers.
\(24\)
and \(25\)
\(23\)
and \(24\)
\(25\)
and \(26\)
\(26\)
and \(27\)
9000020409
Level:
B
One of the solutions of the quadratic equation \( x^{2} + bx - 10 = 0\) is \(x_{1} = 5\). Find the second solution \(x_{2}\) and the value of the coefficient \(b\).
\(x_{2} = -2\) and
\(b = -3\)
\(x_{2} = -3\) and
\(b = -2\)
\(x_{2} = 2\) and
\(b = 3\)
\(x_{2} = 3\) and
\(b = 2\)
9000020410
Level:
B
The quadratic equation
\[
ax^{2} + 4x + c = 0
\]
has solutions \(x_{1} = -3\)
and \(x_{2} = 5\). Find the
coefficients \(a\)
and \(c\).
\(a = -2\),
\(c = 30\)
\(a = -2\),
\(c = -30\)
\(a = 2\),
\(c = -30\)
\(a = 2\),
\(c = 30\)