4
QuizMultiple Choice

Solving Quadratic Equations: Quadratic Formula

Question 4 • Common Core Algebra I 2014 - MA3109 B-CR

What is the value of the discriminant for the quadratic equation 0 = x + 2 + x2?Discriminant = b2 – 4ac

Answer
A
–9
B
–7
C
7
D
9

Explanation

Write the equation in standard form as x² + x + 2 = 0, so a = 1, b = 1, and c = 2. Using the discriminant formula b² − 4ac gives 1² − 4(1)(2) = 1 − 8 = −7. The correct choice is B, −7.

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