What is the value of x ?
(1) \(4^{x + 1} + 4^x = 320\)
(2) \(x^2 = 9\)
OA A
Source: Official Guide
(1) \(4^{x + 1} + 4^x = 320\)
(2) \(x^2 = 9\)
OA A
Source: Official Guide
Let's take each statement one by one.BTGmoderatorDC wrote:What is the value of x ?
(1) \(4^{x + 1} + 4^x = 320\)
(2) \(x^2 = 9\)
OA A
Source: Official Guide
(1) \(4^{x + 1} + 4^x = 320\)
\(4^x*(4 + 1) = 320\)
\(4^x*5 = 320\)
\(4^x = 64\)
\(x=3\). Sufficient
(2) \(x^2 = 9\)
\(x = ±3\). No unique answer. Insufficient.
The correct answer: A
Hope this helps!
-Jay
_________________
Manhattan Review GRE Prep
Locations: GRE Classes Raleigh NC | GRE Prep Course Singapore | GRE Prep Philadelphia | SAT Prep Classes Toronto | and many more...
Schedule your free consultation with an experienced GMAT Prep Advisor! Click here.
