#1 is b and #2 is also b ,, i think..so sorry if i’m wrong!
Answer: C) All real values of x such that
In other words, x must be 0 or smaller.
===================================================
Explanation:
The reason why is because we must make the stuff under the square root to never be negative. We must make -2x be 0 or larger.
So,
As an example, if x = -2, then -2x = -2(-2) = 4 is positive. Applying the square root to a positive number is valid.
But if x = 5, then -2x = -2*5 = -10 is under the square root, which is not allowed.
You need to divide 25.4 and 4 and you'll get 6.35