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12r^2 51r + 45 =
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26 Aug 2022, 06:40
26 Aug 2022, 06:40
Expert Reply
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Question Stats:
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\(12r^2 – 51r + 45 =\)
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)
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GRE Math Essentials (2022)
GRE Geometry Formulas
GRE - Math Book
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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 :
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