Solve using the Quadratic Formula: x² + 10x + 21 = 0
To solve the quadratic equation using the Quadratic Formula, we first identify the coefficients (a), (b), and (c):
a = 1
b = 10
c = 21
The Quadratic Formula is:
Step 1: Calculate the Discriminant
First, we calculate the discriminant (D):
D = 100 - 84 = 16
Step 2: Apply the Quadratic Formula
Now we substitute (b), (D), and (a) into the formula:
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