Is ( square root 12 -4)(4+square root 12) rational or irrational

asked Mar 8, 2017 110k views

4 votes

8.0k points

Please log in or register to add a comment.

5 votes

remember
(a-b)(a+b)=a²-b²

we can rewrite what we were given into

( √(12)-4)( √(12)+4)=( √(12))^2-(4)^2=12-16=-4

definitely rational

AndRSoid answered Mar 13, 2017

7.5k points

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

9.4m questions

12.2m answers