9000085601
Level:
A
Evaluate the following numbers and round to the nearest tens.
\[
10^{2} + 11^{2} + 12^{2} + 13^{2} + 14^{2}
\]
\(730\)
\(720\)
\(740\)
\(750\)
A
9000086706
Level:
A
Identify the equation which arises from the following equation using an optimal
substitution.
\[
2\cos ^{2}x - 7\cos x + 3 = 0
\]
\(2t^{2} - 7t + 3 = 0\)
\(2t^{2} = \frac{3}
{7}\)
\(\cos t = 0\)
\(7\cos t = 3\)
9000083705
Level:
A
Find all the values of \(x\in \mathbb{R}\)
for which the given expression equals zero.
\[
\frac{2x(x + 2)(x - 3)}
{x^{2} - 4}
\]
\(x = 0,\ x = 3\)
\(x = -2,\ x = 0,\ x = 3\)
\(x = 0\)
\(x =\pm 2\)
9000083706
Level:
A
Find all the values of \(x\in \mathbb{R}\)
for which the given expression equals zero.
\[
\frac{4x^{2} - 36}
{4x^{2} + 24x + 36}
\]
\(x = 3\)
\(x = 4\)
\(x = -3,\ x = 3\)
The expression never equals zero.
9000083707
Level:
A
Find all the values of \(x\in \mathbb{R}\)
for which the given expression equals zero.
\[
\frac{4x^{3} + 20x^{2} + 25x}
{x + 1}
\]
\(x = 0,\ x = -\frac{5}
{2}\)
\(x = 0\)
\(x = -\frac{5}
{2}\)
\(x = -1\)
9000083708
Level:
A
Find all the values of \(x\in \mathbb{R}\)
for which the given expression equals zero.
\[
\frac{x^{2} - (2x - 1)^{2}}
{x^{2} - 4}
\]
\(x = \frac{1}
{3},\ x = 1\)
\(x = -\frac{1}
{3},\ x = 1\)
\(x =\pm 2\)
\(x = 1\)
9000083709
Level:
A
Find all the values of \(x\in \mathbb{R}\)
for which the given expression equals zero.
\[
\frac{(2x + 3)^{2} - (3x - 2)^{2}}
{x - 5}
\]
\(x = -\frac{1}
{5}\)
\(x = 5\)
\(x = -5\)
\(x = \frac{1}
{5}\)
9000083710
Level:
A
Find all the values of \(x\in \mathbb{R}\)
for which the given expression equals zero.
\[
\frac{(4x + 3)^{2} - (5x - 2)^{2}}
{5 + x}
\]
\(x = 5,\ x = -\frac{1}
{9}\)
\(x = -5\)
\(x = -\frac{5}
{9},\ x = 1\)
\(x = 1,\ x = \frac{5}
{9}\)
9000083602
Level:
A
Evaluate the following expression at \(x = \frac{1}
{2}\).
\[
\frac{x^{2} - 2}
{1 -\frac{1}
{x}}
\]
\(\frac{7}
{4}\)
\(-\frac{7}
{4}\)
\(\frac{7}
{2}\)
\(-\frac{7}
{2}\)
9000083603
Level:
A
Evaluate the following expression at \(x = \frac{1}
{2}\)
and \(y = -\frac{1}
{4}\).
\[
\frac{x -\frac{y}
{x}}
{1 + \frac{x}
{y}}
\]
\(- 1\)
\(3\)
\(4\)
\(1\)