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​Quadratic Equations - Factorising: Quiz 2 - Answers

1) (x + 3)(x – 3)

 

2) (x + 6)(x – 6)

 

3) (x + 9)(x – 9)

 

4) (7 + x)(7 – x)

 

5) (2x + 4)(2x – 4)

 

6) (x + y)(x – y)

 

7) (3x + 5y)(3x – 5y)

 

8) (x2 + y3)(x2 – y3)

 

9) (6x2y + 7z4n3) (6x2y – 7z4n3)

Working
Questions
Factorise the following quadratics. ​

1) x2 – 9

 

2) x2 – 36

 

3) x2 – 81

 

4) 49 – x2

 

5) 4x2 – 16

 

6) -y2 + x2

 

7) 9x2 – 25y2

 

8) x4 – y6

 

9) 36x4y2 – 49z8n6