algebra/trig
posted by Carla on .
1. which number below is irrational?
a)√4/9 b) √20 c)√121
Why is the number you chose irrational?
2. express in simplest form:
√485√27+2√75
3. solve for x: (√x+2)3=0

1. Which numbers are NOT perfect squares?
2. √485√27+2√75
= √16√3  5√9√3 + 2√25√3
= 4√3  15√3 + 10√3
= √3
3. I will assume you meant
√(x+2)  3 = 0
then √(x+2) = 3
square both sides
x+2 = 9
x = 7
since we squared, we MUSYT verify all answers.
if x=7
LS = √(7+2)  3
= √9  3
= 0
= RS
so x = 7