Q3 of 53 Page 166

Foctorise the following:

x2 – 4x – 192

⇒ x2 - 4x – 192


⇒ x2 - 16x + 12x – 192


⇒ x(x – 16) + 12(x – 16)


⇒ (x – 16)(x + 12)


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3

Foctorise the following:

x2 – 3x – 18

 3

Foctorise the following:

x2 + 4x – 21

 3

Foctorise the following:

x4 – 5x2 + 4

 3

Foctorise the following:

x4 – 13x2y2 + 36y4.