3. Factorise the following quadratic expressions fully.
(i) x2 − 9 (i) x2 − 1 (i) x2 − 49 (ii) x2 − 25
4. Factorise the following quadratic expressions fully.
(ii) t2 − 100
5. Factorise the following quadratic expressions fully.
(ii) x2 − 169 (iii) y2 − 81
6. If square A has side length of 4 units and square B has a side length x , fi nd a term for the area of each square. Hence, write an expression for the diff erence in area of these two squares.
(iii) x2 − 400 (iii) n2 − 144
9. If the expression 9 − x2 describes the diff erence in area of two squares, write down a term for the perimeter of each of the two squares.
10. If the expression a2 − b2
describes the diff erence in area of two squares, write down a term for the perimeter of each of the two squares.
7.
If square A has side length 2 and square B has a side length w , fi nd a term for area of each square. Hence, write an expression for the diff erence in area of these two squares.
8. Factorise the following quadratic expressions fully.