(A) 3.464
(B) 3.932
(C) 4.000
(D) 4.444答案: (C)
解释:
let x = the given expression.
Now squaring both sides.
(x)^2 = 12 + x
(x)^2 - x - 12 = 0
Now solve this quadratic equation for finding the
roots(value of x, or this expression).
(x-4)(x+3) = 0
hence x = 4.
这个问题的测验