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02 Jan 2015, 20:04
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Solve:
(√(8+√63) + √(8-√63) )^2 =
(a) 20
(b) 19
(c) 18
(d) 17
(e) 16
If you use Calc: its really easy to figure out the answer.
For GMAT, Please suggest method to solve without calc.
(√(8+√63) + √(8-√63) )^2 =
(a) 20
(b) 19
(c) 18
(d) 17
(e) 16
If you use Calc: its really easy to figure out the answer.
For GMAT, Please suggest method to solve without calc.
02 Jan 2015, 23:39
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Hi amidamani13,
Many of the questions that you'll face on the GMAT are based on patterns/rules that you already know, but you'll be tested on those rules in ways that you might not have thought about before. Here, the "math" looks crazy, so the question CAN'T really be about doing the math - it's got to be about something else...
If you ignore the numbers and the square root signs, don't we just have...
(X + Y)^2
I think that you can probably see that this is a Classic Quadratic...
X^2 + 2XY + Y^2
At this point, can you "insert" the respective values for X and Y and solve? If you're still stuck, post back and I'll walk you through the rest of the calculation.
GMAT assassins aren't born, they're made,
Rich
Many of the questions that you'll face on the GMAT are based on patterns/rules that you already know, but you'll be tested on those rules in ways that you might not have thought about before. Here, the "math" looks crazy, so the question CAN'T really be about doing the math - it's got to be about something else...
If you ignore the numbers and the square root signs, don't we just have...
(X + Y)^2
I think that you can probably see that this is a Classic Quadratic...
X^2 + 2XY + Y^2
At this point, can you "insert" the respective values for X and Y and solve? If you're still stuck, post back and I'll walk you through the rest of the calculation.
GMAT assassins aren't born, they're made,
Rich
03 Jan 2015, 12:40
Kudos
Bookmarks
Hi,
Thanks for your reply.
I have tried to use that algebraic rule and solve it but somehow Im unable to get the final right answer.
Would really appreciate if you could guide me through a step-by-step solution.
Regards,
Ami
Thanks for your reply.
I have tried to use that algebraic rule and solve it but somehow Im unable to get the final right answer.
Would really appreciate if you could guide me through a step-by-step solution.
Regards,
Ami
