fc2262a wrote:
The square of an even number equals 6 less than 5 times the number. Which of the following is the square of the number?
A) 2
B) 3
C) 4
D) 6
E) 9
We can let n = the number, and thus:
n^2 = 5n - 6
n^2 - 5n + 6 = 0
(n - 3)(n - 2) = 0
n = 3 or n = 2
Since n is even, n must be 2. The square of 2 is 4.
Answer: C
