GRE Prep Club Daily Prep
Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.
Customized
for You
Track
Your Progress
Practice
Pays
Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.
If y= square root of 0.36x^8, then y =
[#permalink]
21 Jun 2017, 02:19
21 Jun 2017, 02:19
Expert Reply
00:00
Question Stats:
83% (00:33) correct
16% (00:33) wrong based on 65 sessions
Hide Show timer Statistics
If \(y= \sqrt{0.36x^8}\), then y =
A) \(0.06x^2\)
B) \(0.06x^4\)
C) \(0.06x^5\)
D) \(0.6x^2\)
E) \(0.6x^4\)
Re: If y= square root of 0.36x^8, then y =
[#permalink]
01 Feb 2018, 11:19
01 Feb 2018, 11:19
1
y=sq. root(0.36*x^8) or, y= sq. root(((6/10)*x^4)^2) or, y= 0.6*x^4
So the answer is E.
So the answer is E.
Sherpa Prep Representative
Joined: 15 Jan 2018
Posts: 147
Given Kudos: 0
Re: If y= square root of 0.36x^8, then y =
[#permalink]
01 Feb 2018, 13:30
01 Feb 2018, 13:30
2
Expert Reply
If y= √(0.36x^8), one way to simplify it would be to split the roots so y = √(.36)√(x^8). Then we can take the square root of them separately. The square root of .36 is .6, since the square root of 36 is 6 and if I need to generate two decimals in the square, I need one decimal in the square root. To put it another way, .6^2 will be .36, since when you multiply two numbers with one decimal place each, the resulting number should have 2 decimals. Now for the second part: √(x^8) must be x^4. To take the square root of any number with an exponent, simply divide the exponent in half. Thus the 8 becomes a 4.
So at the end of all this we have y = .6x^4, or E.
Another way we could've approached this problem is to look at the answer choices and square all of them. Whichever one winds up being the same as everything under the radical must be the correct answer.
So at the end of all this we have y = .6x^4, or E.
Another way we could've approached this problem is to look at the answer choices and square all of them. Whichever one winds up being the same as everything under the radical must be the correct answer.
