The graph of any quadratic equation $y=ax^2+bx+c$y=ax2+bx+c, $a\ne0$a≠0, is called what?

A straight line

A

A parabola

B

An exponential

C

A hyperbola

D

A straight line

A

A parabola

B

An exponential

C

A hyperbola

D

Easy

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Consider the general quadratic equation $y=ax^2+bx+c$y=ax2+bx+c, $a\ne0$a≠0. Which of the following statements about the parabola described by this equation is true?

Does the parabola represented by the equation $y=x^2-8x+9$y=x2−8x+9 open upward or downward?

Does the parabola represented by the equation $y=-3x^2+5x-7$y=−3x2+5x−7 open upward or downward?