- Have any questions?
- [email protected]
- Home
- If 7^(x - y) = 343 and 7^(x + y) = 16807, what is the value of x?
Question 1:
If 7^(x - y) = 343 and 7^(x + y) = 16807, what is the value of x? A. 4
Feedback 7^(x - y) = 343 = 7^3
=> x - y = 3 ---------------------------(Equation 1)
7^(x + y) = 16807 = 7^5
=> x + y = 5 ---------------------------(Equation 2)
(Equation 1)+ (Equation 2) => 2x = 3 + 5 = 8
=> x = 8⁄2 = 4
=> x - y = 3 ---------------------------(Equation 1)
7^(x + y) = 16807 = 7^5
=> x + y = 5 ---------------------------(Equation 2)
(Equation 1)+ (Equation 2) => 2x = 3 + 5 = 8
=> x = 8⁄2 = 4
B. 3
C. 2
D. 1
These questions are from this test. Would you like to take a practice test?