189k views
4 votes
How do you factor x^2-5=0

User Natti
by
7.9k points

1 Answer

3 votes
Do you remember the special case of factoring the difference of 2 squares ?

x² - 5 = (x + √5) (x - √5)

That will be zero if either factor is zero.

First factor:
x + √5 = 0
x = -√5

Second factor:
x - √5 = 0
x = √5
===================================

Another way to look at it is just to sit there and LOOK at it.

x² - 5 = 0

x² = 5

This is true if x = + or - √5 .
User Ben Fischer
by
8.1k points

No related questions found

Welcome to QAmmunity.org, where you can ask questions and receive answers from other members of our community.

9.4m questions

12.2m answers

Categories