The ratio black to blue bags is 5 to3 if there is 10 black bags how many blue bags?
1 answer:
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Answer:
D
Step-by-step explanation:
Given
x² + 6x - 9 = 0 (add 9 to both sides )
x² + 6x = 9
Using the method of completing the square
add ( half the coefficient of the x- term )² to both sides
x² + 2(3)x + 9 = 9 + 9
(x + 3)² = 18 ( take the square root of both sides )
x + 3 = ± = ±
= ± 3
Subtract 3 from both sides
x = - 3 ± 3 → D