Which of the following could represent 3 consecutive integers?

I pick two consecutive integers. I square the bigger one and then subtract 4 of the smaller one. Which example could be my calculation?

The answer is always bigger than both of the original numbers.

The answer is always the square of one less than one of the original numbers.

The answer is always the square of one of the original numbers.

I pick two consecutive integers. I square the bigger one and then subtract 4 of the smaller one. Write out some examples of these. What do you notice about the answers?

I pick two consecutive integers. I square the bigger one and then subtract 4 of the smaller one. Which example could be an algebraic representation of this situation?

I pick two consecutive integers. I square the bigger one and then subtract 4 of the smaller one. Zaki writes a different algebraic expression to me but is still correct. Which one could he have written?

I pick two consecutive integers. I square the bigger one and then subtract 4 of the smaller one. Alex and Steven have both tried to generalise my pattern. Who is correct?

Key Stage 3

Interesting quadratic patterns

Select the words that best fill in the gaps in order: The __________ is where the curve crosses the y axis, when _______.

What are the coordinates of where y= x² + 14x + 24 crosses the y axis?

Where does y = x² - 3x - 10 cross the y axis?

Which graph could be a sketch of y=(x+4)(x-3)?

Which graph could be a sketch of -x² + 3x - 2? *Hint* Try out some coordinates to check!

Zaki is correct, the curve will never cross either axes.

Zaki is incorrect the curve wil cross the x axis only.

Zaki is incorrect the curve will cross BOTH axes.

Zaki is incorrect the curve will cross the y axis only.

Zaki says y = x² + 1 will never cross either axes. Is that correct?

Interesting quadratic patterns

Lesson outcome