2. A pair of dice is rolled. What is the probability that the sum of the dice is either a 9 or a 3?
1 answer:
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Answer:
Step-by-step explanation:
This is a hard one
We have to use the rational root theorem
= 0
We have to find all the factors of a and d and put them in a fraction
We then plug them into the equation to see if any of them work
The equation isn't true when plugging 1, but is true when plugging in 1/2
factored form of 1/2 is (2x-1)
Then we divide the original equation by (2x-1) (you can use synthetic division or long division, it would be hard to type out the process for that) to get
So now the equation is
Solve the second half of this equation using the quadratic formula to get
and
We already know the solution for the first half of the equation (1/2)
So the final answers are:
Answer:
Step-by-step explanation:
Solve the value of :
-Combine and
by subtracting
by
:
-Subtract on both sides:
-Multiply both sides by , the reciprocal of
:
Therefore, the value of is
.