Quadratic Equations

NZ Level 7 (NZC) Level 2 (NCEA)

Graph basic quadratics

Consider the equation $y=-x^2$`y`=−`x`2

a

Complete the following table of values.

$x$x |
$-3$−3 | $-2$−2 | $-1$−1 | $0$0 | $1$1 | $2$2 | $3$3 |

$y$y |
$\editable{}$ | $\editable{}$ | $\editable{}$ | $\editable{}$ | $\editable{}$ | $\editable{}$ | $\editable{}$ |

b

Plot the points in the table of values.

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c

Hence plot the curve.

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d

Are the $y$`y` values ever positive?

No

A

Yes

B

No

A

Yes

B

e

What is the maximum $y$`y` value?

f

Write down the equation of the axis of symmetry.

Easy

Approx 4 minutes

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