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October 1, 2014

October 1, 2014

Posted by **Anonymous** on Saturday, September 3, 2011 at 3:33pm.

1) x^4 - 9x^2> 0

2) 4x2^x - x^3 2^x<or equal to 0

I dont 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**, Saturday, September 3, 2011 at 3:45pm1)x^2(x^2-9)=x^2(x-3)(x+3)>0

x>3 or x<-3

2)x*2^x(4-x^2)=x*2^x(2-x)(2+x)<=0

-2<=x<=0 or x>=2

- calculus -
**Anonymous**, Saturday, September 3, 2011 at 4:42pmHow did you get those 2 answers for 2?

- calculus -
**Mgraph**, Saturday, September 3, 2011 at 4:51pma^2-b^2=(a-b)(a+b)

4-x^2=2^2-x^2

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