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Updated on: 18 Dec 2014, 10:11
Originally posted by Gmatdecoder on 18 Dec 2014, 09:31.
Last edited by Bunuel on 18 Dec 2014, 10:11, edited 1 time in total.
Last edited by Bunuel on 18 Dec 2014, 10:11, edited 1 time in total.
RENAMED THE TOPIC.
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B
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Difficulty:
45%
(medium)
Question Stats:
64% (01:42) correct
36%
(01:41)
wrong
based on 384
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If the function f is defined for all x by f(x)= ax^2+bx-43, where a and b are constants, what is the value of f(3)?
(1) f(4)=41
(2) 3a +b=17
My question is statement 1 gives a linear equation and so does the question stem? why isn't it sufficient?
(1) f(4)=41
(2) 3a +b=17
My question is statement 1 gives a linear equation and so does the question stem? why isn't it sufficient?
18 Dec 2014, 10:22
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If the function f is defined for all x by f(x)= ax^2+bx-43, where a and b are constants, what is the value of f(3)?
We want the value of f(3), which is 9a + 3b - 43
(1) f(4)=41. This implies that 16a + 4b- 43 = 41. Fromthis we cannot get the value of 9a + 3b - 43. Not sufficient.
(2) 3a +b=17 --> multiply by 3: 9a + 3b = 51, therefore 9a + 3b - 43 = 51 - 43 = 8. Sufficient.
Answer: B.
We want the value of f(3), which is 9a + 3b - 43
(1) f(4)=41. This implies that 16a + 4b- 43 = 41. Fromthis we cannot get the value of 9a + 3b - 43. Not sufficient.
(2) 3a +b=17 --> multiply by 3: 9a + 3b = 51, therefore 9a + 3b - 43 = 51 - 43 = 8. Sufficient.
Answer: B.
P.S. Please read carefully and follow: rules-for-posting-please-read-this-before-posting-133935.html Pay attention to rule 3. Thank you.
18 Dec 2014, 10:23
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Gmatdecoder
Check function questions in our Special Questions Directory:
Operations/functions defining algebraic/arithmetic expressions
Symbols Representing Arithmetic Operation
Rounding Functions
Various Functions
