Final answer:
The answer to the expression (2, 4, 6) + (-3, 2, -5) is -1 after evaluating each part separately and adding the results. The reference information provided in the question seems to be about solving quadratic equations using the quadratic formula.
Step-by-step explanation:
To solve the given question involving the expression (a, b, c) = abc / (a + b + c), we first evaluate it separately for the two sets of numbers. Starting with (2, 4, 6), we substitute the respective values into the expression:
(2, 4, 6) = 2*4*6 / (2 + 4 + 6) = 48 / 12 = 4
Next, we evaluate (-3, 2, -5):
(-3, 2, -5) = (-3)*2*(-5) / (-3 + 2 - 5) = 30 / (-6) = -5
Adding the two results together:
4 + (-5) = -1
The answer to (2, 4, 6) + (-3, 2, -5) is -1.
Now let's address the given reference information which seems unrelated to the initial question. It resembles the quadratic formula ax² + bx + c = 0, where solutions for x are found using:
x = [-b ± √(b² - 4ac)] / (2a)
This is a fundamental concept in algebra called the quadratic equation. The provided examples show how to use the quadratic formula with various coefficients (a, b, c). Remember that when applying the formula, the sign before the square root can lead to two different solutions.