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2.04 Quadratic functions

Interactive practice questions

Consider the general quadratic equation $y=ax^2+bx+c$y=ax2+bx+c, $a\ne0$a0. Which of the following statements about the parabola described by this equation is true?

The parabola will open to the left if $a<0$a<0, and will open to the right if $a>0$a>0.

A

The parabola will open upwards if $a>0$a>0, and will open downwards if $a<0$a<0.

B

The parabola will open upwards if $a<0$a<0, and will open downwards if $a>0$a>0.

C

The parabola will open to the left if $a>0$a>0, and will open to the right if $a<0$a<0.

D
Easy
< 1min

Does the parabola represented by the equation $y=x^2-8x+9$y=x28x+9 open upward or downward?

Easy
< 1min

The graph of $y=x^2+6$y=x2+6 has no $x$x-intercepts.

True or False?

Easy
< 1min

Which of the following can be found without any calculation in the equation of the form $y=\left(x-h\right)^2+k$y=(xh)2+k but not in the equation of the form $y=x^2+bx+c$y=x2+bx+c?

Easy
< 1min
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Outcomes

1.2.2.1

examine examples of quadratically related variables

1.2.2.2

recognise and determine features of the graphs of 𝑦=𝑥^2,𝑦=𝑎𝑥^2 +𝑏x+𝑐, 𝑦=𝑎(𝑥−𝑏)^2+𝑐, and 𝑦=𝑎(𝑥−𝑏)(𝑥−𝑐), including their parabolic nature, turning points, axes of symmetry and intercepts

1.2.4.7

solve equations involving combinations of the functions above, using technology where appropriate

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