COolguy101 wrote:
rx10 wrote:
\(\frac{16}{g} = \frac{g}{49}\)
\(g^2 = 49*16\)
\(g = 28 \)
Hence answer
Cjantje wrote:
Which is right? 5lb says its D.
But how can it be that then the result becomes 16:-28?
What is answer sir, you are saying C, OA saying its D, For my knowledge its should C as official guide clearly mention that square root can not be negative. Its pretty confusing. Need help from Quant expert
GreenlightTestPrepThere is an important difference between the equation x² = 25 and the equation x = √25
There are TWO solutions to the equation x² = 25. Here's why:
We can subtract 25 from both sides of this equation to get: x² - 25 = 0
Factor to get: (x + 5)(x - 5) = 0
So the two solutions are: x = -5 and x = 5
For the equation x = √25, we must recognize that the square root
notation tells us to take the
positive square root only.
So, √25 = 5
Likewise, √81= 9 and √400 = 20
So it's all about the notation.
The equation g² = (49)(16) doesn't have any square root notation.
So, g = 28 or -28
In general. if we have an equation in the form x² = k (where k > 0), then there are two solutions: x = √k and x = -√k
If we have an equation in the form x = √k, and there is one solution: x = the positive square root of k