Which of the following functions is quadratic?

Question

1. Which of the following functions is quadratic?
F(x)=2/x^2
F(x)=7^2
F(x)=3(3-x)
F(x)=2x^2+3x-5

 

 

2. What name is given to the shape of the graph of a quadratic function?

3. In which direction does the graph of the function shown below open?
F(x)=-3x^2+x+7
Down
Left
Right
Up

4. Which of the quadratic functions listed is written in standard form?
y-4=-3(x-5)
y-7=-2(x=3)^2
y=(x+1)(x-5)
y=2x^2+3x-5

Answer 1

1. F(x)=2x² + 3x - 5  is the only quadratic function in the set of 4 functions

 

2. The graph of this quadratic function is a parabola Up . x₁ = -2.5 and x₂ = 1 are the abscissas of the x-axis intercepts. y=-5is the ordinate of the y-axis intercept.

 

3. Down because -3 is negative

 

4. y=2x² + 3x - 5 is the only quadratic function written in standard form.