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.
12r^2 51r + 45 =
[#permalink]
26 Aug 2022, 06:40
26 Aug 2022, 06:40
Expert Reply
00:00
Question Stats:
100% (01:37) correct
0% (00:00) wrong based on 6 sessions
Hide Show timer Statistics
\(12r^2 – 51r + 45 =\)
A \(3(4r -5)(r+3)\)
B \(3(4r+5)(r-3)\)
C \(3(4r+3)(r-5)\)
D \(3(4r-5)(r-3)\)
E \(3r^2 – 15\)
A \(3(4r -5)(r+3)\)
B \(3(4r+5)(r-3)\)
C \(3(4r+3)(r-5)\)
D \(3(4r-5)(r-3)\)
E \(3r^2 – 15\)
Part of the project: GRE QCQ & PS 3 Questions Every One DAILY Challenge - (2022)
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
GRE Math Essentials (2022)
GRE Geometry Formulas
GRE - Math Book
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
GRE Math Essentials (2022)
GRE Geometry Formulas
GRE - Math Book
Re: 12r^2 51r + 45 =
[#permalink]
26 Aug 2022, 06:57
26 Aug 2022, 06:57
Instead of solving algebraically, use a shortcut
Put r = 0 in the equation in the question and then in each of the answer choices. If the answer in both cases is same, we found our solution.
At r=0, 12r2–51r+45= 45
A 3(4r−5)(r+3) = -45
B 3(4r+5)(r−3) = -45
C 3(4r+3)(r−5) = -45
D 3(4r−5)(r−3) = 45
E 3r2–15 = -15
Answer is D
Put r = 0 in the equation in the question and then in each of the answer choices. If the answer in both cases is same, we found our solution.
At r=0, 12r2–51r+45= 45
A 3(4r−5)(r+3) = -45
B 3(4r+5)(r−3) = -45
C 3(4r+3)(r−5) = -45
D 3(4r−5)(r−3) = 45
E 3r2–15 = -15
Answer is D
Re: 12r^2 51r + 45 =
[#permalink]
28 Aug 2022, 07:22
28 Aug 2022, 07:22
1
Posting the algebraic approach for all the algebra lovers :
Attachments
File comment: Solution
Gre_Challenge_Aug26.png [ 162.11 KiB | Viewed 1047 times ]
