4 x square 9 y
- 9 x square 4 y 2 x square
- 9 x square minus y square 4 y 4
- factorise 4x square + 9y square + 16
- 4 x square 9 y square is equal to 1
- 4 x square 9 y square 16 z square 12
- 4x square - 9y square + 20x + 25
- 4 x square 9 y square 16 z square
- 4 x square 9 y square is equal to 36
- 4 x square 9 y square 12 xy
- 4 x square 9 y square
