2000006102
Level:
A
Simplify: \(2(4y^2-2y+5)+2y^2-(3y^2+5y-1)\)
\(7y^2-9y+11\)
\(7y^2+y+11\)
\(7y^2-9y+9\)
\(7y^2+y+9\)
Polynomials and fractions
2010000801
Level:
A
The product \( \left(x-y+4\right)(3x^2y-2xy^2) \) equals:
\( 3x^3y-5x^2y^2+2xy^3+12x^2y-8xy^2 \)
\( 3x^3y+x^2y^2+2xy^3+12x^2y-8xy^2 \)
\( 3x^3y-5x^2y^2+2xy^3-12x^2y-8xy^2 \)
\( 3x^3y-x^2y^2+2xy^3+12x^2y-8xy^2 \)
2010000807
Level:
A
Assuming \(x\neq 0\),
\(y\neq 0\),
\(x\neq -y\),
simplify the following expression.
\[ {
\frac{1}
{y^{2}} - \frac{1}
{x^{2}}
\over -\frac{1}
{x} - \frac{1}
{y}}
\]
\(\frac{y-x}
{xy} \)
\(\frac{x-y}
{xy} \)
\(x-y\)
\(y-x\)
2010000808
Level:
A
Assuming \( x \notin \{0;1;3\}\), simplify the following expression.
\[\frac{x^2-9}{x^2-x}:\frac{x^2-3x}{x-1}\]
\( \frac{x+3}{x^2} \)
\( \frac{x-3}{x^2}\)
\( \frac{x+3}{2x}\)
\( \frac{x+3}{x} \)
2010000809
Level:
A
Assuming \( x \notin \{-4;0;3;4\}\), simplify the following expression.
\[\frac{x^2-3x}{x^2-16}:\frac{x-3}{x^2+4x}\]
\( \frac{x^2}{x-4} \)
\( \frac{x-4}{x^2} \)
\( \frac{x-4}{x} \)
\( \frac{x}{x-4} \)
2010000810
Level:
A
Evaluate the following expression at \(x = 4\).
\[\frac{\frac{1}{\sqrt{x}}}{\frac{1}{x^2}-\frac{1}{x}}\]
\(- \frac{8}{3}\)
\(\frac{31}{3}\)
\( \frac{8}{3}\)
\( 6\)
2010000811
Level:
A
Evaluate the following expression at \(x = 9\).
\[\frac{\frac{1}{x}+\frac{1}{x^2}}{\frac{1}{\sqrt{x}}}\]
\( \frac{10}{27}\)
\( -\frac{10}{9}\)
\(-30\)
\(30\)
2010000812
Level:
A
Assuming \( y \neq 1\), \(x\neq \pm y\), simplify the expression:
\[\frac{y^2-2xy+x^2}{(1-y)(y-x)}\cdot\frac{3y^2-6y+3}{x^2-y^2}\]
\(\frac{3(y-1)}{x+y}\)
\(\frac{3(1-y)}{x+y}\)
\(\frac{3}{x+y}\)
\( 3\)
2010001301
Level:
A
Expand \( (x-1)(1-x+x^2)(x+1)\).
\( x^4-x^3+x-1\)
\( x^4-x^3+2x^2+x-1\)
\( x^4+x^3-x+1\)
\( x^4+x^3-2x^2+x-1\)
2010001302
Level:
A
Expand the polynomial \(\left (2x-3x^2\right )^{2} -\left (3x^2 + 2x\right )^{2}\).
\(-24x^3\)
\(0\)
\(8x^2\)
\(8x^2-24x^3\)