Question

factorise x^2-4 please explain ​

Answer 1

Step-by-step explanation:

(

x

+

2

)

(

x

−

2

)

Explanation:

Notice we can write:

x

2

−

4

as

x

2

−

2

2

This is the difference of two squares:

a

2

−

b

2

=

(

a

+

b

)

(

a

−

b

)

∴

x

2

−

2

2

=

(

x

+

2

)

(

x

−

2

)

Answer link

Answer 2

Step-by-step explanation:

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