Quadratic Equations

Hong Kong

Stage 4 - Stage 5

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

A straight line

A

A parabola

B

An exponential

C

A hyperbola

D

Easy

< 1min

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

Easy

< 1min

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

Easy

< 1min

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

Easy

< 1min

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