1. Teacher's Notes Topic: Alg - expand brackets Brackets
3(2a + 1) = 6a + 1
Show why Jenny is wrong.
(a) Jenny wants to multiply out the brackets in the expression 3(2a + 1)
She writes:
How many ways can you show this?
Eg - Substitute a = 5 ...
- Expand the brackets correctly
- Show using area ...
(k + 4)(k + 7) = k2 + 28
Show why Sandeep is wrong.
(b) Sandeep wants to multiply out the brackets in the expression (k + 4)(k + 7)
He writes:
How many ways can you show this?
Eg - Substitute a = 5 ...
- Expand the brackets correctly
- Show using area ...

2. Brackets
(a) Jenny wants to multiply out the brackets in the expression 3(2a + 1)
She writes:
3(2a + 1) = 6a + 1
Show why Jenny is wrong.

3. (b) Sandeep wants to multiply out the brackets in the expression (k + 4)(k + 7)
He writes:
(k + 4)(k + 7) = k2 + 28
Show why Sandeep is wrong.