Posted by rebekah on Monday, October 1, 2012 at 9:53pm.
#1. solve x^21<0 I got (1,1)
#2 x(x+1) >20
I got (infinity, 4) U (5,infinity)
#3
what is the domain of this function? f(x)= squre root of (x3x^2)
i got [1/3,0]
thanks!!!

check my precalc  Reiny, Monday, October 1, 2012 at 10:06pm
#1
correct
for #2
x^2 + x  20 > 0
(x+5)(x4) > 0
critical values are 5 and +4
In my notation it would be
x < 5 OR x > 4
Your (infinity, 4) U (5,infinity) should then be
(infinity, 5) U (4,infinity)
#3
correct

check my precalc  rebekah, Tuesday, October 2, 2012 at 6:55am
Thanks so much!
Answer This Question
Related Questions
 Check my precalc  1. find without a calc log base 5 of cubed root of 25. I got ...
 Algebra ASAP  Could you please help me and check my answers? Find the domain ...
 Functions  Could you please help me and check my answers? Find the domain of ...
 Check my precalc?  #1: f(x) = x^24x find vrtex, axis ofsym, yint, xint if ...
 Math Please Check  Please tell me if this are right. Thank you! Find the exact ...
 Precalc  #1: f(x) = x^24x find vrtex, axis ofsym, yint, xint if any, domain...
 Algebra  please check my answers. thanxs! Solve the polynomial inequality and ...
 Quadractic Functions  Please check my answers. Find the xintercepts (if any) ...
 Inequality  please check my answers. thanxs! Solve the polynomial inequality ...
 Please check my Caclulus  1. Find all intervals on which the graph of y=(x^2+1...
More Related Questions