PSAT Math Multiple-Choice Practice Question 758
Question: 758
Which of the following could be a value of x in this equation?
8x2 = -16x - 2
I. 
II. 
III. 
Correct Answer: C
Explanation:
(C) Since this is a 2nd-degree equation, it should have two solutions.
Complete the square:
Use the quadratic equation to find the answers:
Then simplify the two solutions to see what they equal:
and
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