Answer:
(-7 ± √(-23)) / 4
Step-by-step explanation:
Unless you have to show your work, you don't really have to use the quadratic formula unless it is unfactorable.
2x² + 9 = -7x (Add 7x to both sides)
2x² + 7x + 9 = 0 ( The quadratic formula is (-b ± √(b^2 - 4ac))/2a )
A = 2
B = 7
C = 9
(-7 ± √(49 - 72))/4
= (-7 ± √(-23))/4 (Which simplifies to an imaginary answer, proving that this is, indeed, unfactorable)
= (-7 ± √(-23))/4
Answer:
11:18
Step-by-step explanation:
so first you solve how many helpers there are as a whole
Then once you have that then place the number of technicians first because that is what they ask for it first
Next you put the whole number of helpers then you are good to go
The probability is simply the chance you have of getting each color.
Therefore:
Black= 4/12 or 1/3
Blue or Red= 8/12 or 2/3