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

we will pick new questions that match your level based on your Timer History

Track Your Progress

every week, we’ll send you an estimated GMAT score based on your performance

Practice Pays

we will pick new questions that match your level based on your Timer History

Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.

QOTD # 4 The function f is defined by [#permalink]
13 Sep 2016, 01:55

Expert's post

00:00

Question Stats:

78% (00:44) correct
21% (01:12) wrong based on 33 sessions

The function f is defined by \(f(\frac{x + 3}{2}) = 3x^2 - x + 5\) for all x

Quantity A

Quantity B

f(4)

75

A)The quantity in Column A is greater. B)The quantity in Column B is greater. C)The two quantities are equal. D)The relationship cannot be determined from the information given.

Re: QOTD # 4 The function f is defined by [#permalink]
17 Sep 2016, 07:47

2

This post received KUDOS

Expert's post

Carcass wrote:

The function f is defined by \(f(\frac{x + 3}{2}) = 3x^2 - x + 5\) for all x

Quantity A

Quantity B

f(4)

75

A)The quantity in Column A is greater. B)The quantity in Column B is greater. C)The two quantities are equal. D)The relationship cannot be determined from the information given.

Practice Questions Question: 4 Page: 203

We're told that f[(x+3)/2] = 3x² - x + 5

Quantity A tells us to INPUT a value of 4

So, we can conclude that (x+3)/2 = 4 When we solve this equation, we get x = 5 In other words, f(4) = f[(5+3)/2] = 3(5²) - 5 + 5 = 75 - 5 + 5 = 75