A

9000023805

Level: 
A
Identify a true statement about the following equation. \[ \sqrt{6 + x} = -x \]
The solution is in the set \(\left \{x\in \mathbb{R} : -4 < x\leq - 1\right \}\).
The solution is in the set \(\left \{x\in \mathbb{R} : 1\leq x\leq 5\right \}\).
The solution is in the set \(\left \{x\in \mathbb{R} : -6\leq x\leq - 3\right \}\).
The solution is in the set \(\left \{x\in \mathbb{R} : -2 < x < 3\right \}\).

9000023703

Level: 
A
Identify a true statement which concerns the following equation. \[ \sqrt{x + 1} = 2 \]
The solution is a number from the interval \([ 2;5)\).
The solution is a number from the interval \([ - 1;2] \).
The solution is a number from the interval \([ - 2;3)\).
The solution is a number from the interval \((4;7)\).

9000022802

Level: 
A
Find all \(x\in \mathbb{R}\) for which the following expression is undefined. \[ \log \left (2x^{2} + 4x - 6\right ) \]
\(\left [ -3;1\right ] \)
\(\left (-\infty ;-3\right )\cup \left (1;\infty \right )\)
\(\left (-3;1\right )\)
\(\left (-\infty ;-3\right ] \cup \left [ 1;\infty \right )\)

9000023704

Level: 
A
Identify a true statement which concerns the following equation. \[ \sqrt{x + 20} = 4 \]
The solution is from the set \(B = \left \{x\in \mathbb{R} : -6\leq x\leq - 2\right \}\).
The solution is from the set \(A = \left \{x\in \mathbb{R} : -4 < x\leq - 1\right \}\).
The solution is from the set \(C = \left \{x\in \mathbb{R} : -7\leq x\leq - 5\right \}\).
The solution is from the set \(D = \left \{x\in \mathbb{R} : -3 < x < 0\right \}\).

9000022305

Level: 
A
Find the domain of the following expression. \[ \sqrt{-x^{2 } + 16x - 63} \]
\(\left [ 7;9\right ] \)
\(\left (-\infty ;7\right )\cup \left (9;\infty \right )\)
\(\left (-\infty ;-7\right ] \cup \left [ 9;\infty \right )\)
\(\left (7;9\right )\)
\(\left [ -7;9\right ] \)