QQuadratics: Factorisation and Completing the Square

 $9x^2+64$  

 $9x^2\text{+48x+64}$  

  $9x^2-48x+64$  

 $9x^2-64$  

(x-9)(x+1)

(x-5)(x+5)

(x-1)(x+9)

(x+1)(x+9)

(3x - 49)(x + 3)

3(x + 7)(x - 7)

(x - 7)(x + 7)

3(x - 7)(x - 7)

$x^2\ +\ 11x\ +\ 30$

$x^2\ +\ x\ -30$

$x^{2\ }-\ 11x\ -\ 30$

$x^2\ -\ x\ -\ 30$

(x - 4)(x - 9)

(x - 6)(x - 6)

(x - 3)(x - 12)

(x - 2)(x - 18)

(x + 15)(x - 2)

(x - 15)(x + 2)

(x + 3)(x + 10)

(x - 3)(x - 10)

$3x^2\ +\ 14x\ +15$

$3x^2\ -\ 14x\ -\ 15$

$3x^2-\ 8x\ +15$

$3x^2\ -\ 14x\ +\ 15$

doubled then squared

squared then halved

halved then squared

squared then doubled

4

16

64

-16

36

24

144

-36