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Foundation June 2018 Unit 1 Q8

WJECFoundationCurrent spec3 marksSimplifying Basic Expressions

8. Look at the diagram below.
The term in each square in the top two rows is found by using the following rule:

The term in any square is the sum of the terms in the two squares below it.

Some terms are already shown.
Use the rule to write down the missing terms in the three empty squares. [3]

A pyramid of squares: 3 squares on the bottom row (3x, 4x, empty), 2 squares in the middle row (empty, 9x) and 1 empty square on top