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yociyoci
Group Title
Can someone guide me through inequality questions?
i) 152yy^2<0
ii) 20x4x^225>0
 one year ago
 one year ago
yociyoci Group Title
Can someone guide me through inequality questions? i) 152yy^2<0 ii) 20x4x^225>0
 one year ago
 one year ago

This Question is Closed

Mertsj Group TitleBest ResponseYou've already chosen the best response.1
\[y^2+2y15>0\]
 one year ago

yociyoci Group TitleBest ResponseYou've already chosen the best response.0
so now, (y3)(y+5)>0? and y>5 or y<3?
 one year ago

Mertsj Group TitleBest ResponseYou've already chosen the best response.1
The first part is right. If you multiply two factors and get a positive result, then both factors must be positive or both factors must be negative.
 one year ago

Mertsj Group TitleBest ResponseYou've already chosen the best response.1
dw:1361936550944:dw
 one year ago

Mertsj Group TitleBest ResponseYou've already chosen the best response.1
So we see that the solution is y <5 or y>3
 one year ago

yociyoci Group TitleBest ResponseYou've already chosen the best response.0
oh, alright. What about the second question? I got suck at (2x3)^2 > 0
 one year ago

Mertsj Group TitleBest ResponseYou've already chosen the best response.1
\[4x^220x+25<0\] \[(2x5)(2x5)<0\]
 one year ago

yociyoci Group TitleBest ResponseYou've already chosen the best response.0
opps, I was looking at a different one. Yes, I got to (2x5)^2<0
 one year ago

Mertsj Group TitleBest ResponseYou've already chosen the best response.1
dw:1361936871505:dw
 one year ago

Mertsj Group TitleBest ResponseYou've already chosen the best response.1
Oh, it will never be less than 0 but of course we already knew that a real number raised to the second power will always be positive or 0 and never less than 0
 one year ago

yociyoci Group TitleBest ResponseYou've already chosen the best response.0
So there will be no solution in this case, but what if it is (2x5)^2 > 0? Will this work?
 one year ago

Mertsj Group TitleBest ResponseYou've already chosen the best response.1
Yes. Then it would be all real numbers except 0
 one year ago

yociyoci Group TitleBest ResponseYou've already chosen the best response.0
Alright! Thank you so much!
 one year ago
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