calculus
posted by
Anonymous
.
Factor and solve for x
1) x^4  9x^2> 0
2) 4x2^x  x^3 2^x<or equal to 0
I don't know where to start on 1 but for 2 I got
X<or equal to 4 or x> or equal to 4
Could some one please explain how to do 1 and tell me if I did 2 correctly?

calculus 
Mgraph
1)x^2(x^29)=x^2(x3)(x+3)>0
x>3 or x<3
2)x*2^x(4x^2)=x*2^x(2x)(2+x)<=0
2<=x<=0 or x>=2

calculus 
Anonymous
How did you get those 2 answers for 2?

calculus 
Mgraph
a^2b^2=(ab)(a+b)
4x^2=2^2x^2