1.1 Quadratic Equations(Part 1)

Determine whether each of the following expressions is a quadratic expression in one variable.
If not, justify your answer.

 $x^2-5$  

• Yes

• No

Determine whether each of the following expressions is a quadratic expression in one variable.
If not, justify your answer.

 $2x^2-x^{-2}$  

• Yes

• No

Determine whether each of the following expressions is a quadratic expression in one variable.
If not, justify your answer.

 $3y^2-3x+1$  

• Yes

• No

Determine whether each of the following expressions is a quadratic expression in one variable.
If not, justify your answer.

 $-\frac{1}{2}m^2$  

• Yes

• No

Determine whether each of the following expressions is a quadratic expression in one variable.
If not, justify your answer.

 $x^3-x$  

• Yes

• No

Determine whether each of the following expressions is a quadratic expression in one variable.
If not, justify your answer.

 $x^{\frac{1}{2}}-2x-1$  

• Yes

• No

Determine whether each of the following expressions is a quadratic expression in one variable.
If not, justify your answer.

 $p^2-\frac{1}{2}p+3$  

• Yes

• No

Determine whether each of the following expressions is a quadratic expression in one variable.
If not, justify your answer.

 $n\left(n-2\right)$  

• Yes

• No

Determine whether each of the following expressions is a quadratic expression in one variable.
If not, justify your answer.

 $\frac{1}{x^2}+4x-1$  

• Yes

• No

Determine the values of a, b and c for each of the following quadratic expressions.
Write your answer (example; $3x^2+2x+1$  as 3,2,1)

 $2x^2-5x+1$