DerryDelaney
DerryDelaney
16-10-2016
Mathematics
contestada
How do you factorise x^2 - 9.
Respuesta :
Diana5674
Diana5674
16-10-2016
x ^ 2 - 9
= x ^ 2 - 3 ^ 2
It turns into 3 ^ 2
Because 3 ^ 2 = 9
The final answer is
= ( x + 3 )( x - 3 )
remember the formula :
a^2 - b^2 =(a+b)(a-b)
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