How do you factor (x^2-5)(x2−5)?
1 Answer
Oct 29, 2015
Explanation:
The difference of squares identity can be written:
a^2-b^2=(a-b)(a+b)a2−b2=(a−b)(a+b)
In order to treat
x^2-5 = x^2-(sqrt(5)^2) = (x-sqrt(5))(x+sqrt(5))x2−5=x2−(√52)=(x−√5)(x+√5)
In other words, we let