Denominator of a rational expression cannot be 0 because if it will be 0 then the expression will be undefined. Hence, we need to exclude the values of x at which the denominator will be 0. So,
x²-2x-15=0
We can solve this equation by factoring the trinomial on the left side of the equation.
For that we need to find the two multiples of the constant term -15 so that their addition will result the coefficient of -2.
So, -15= -5*3 and -5+3=-2.
So, we can replace -2x with -5x+3x in the above equation.
x²-5x+3x-15=0
(x²-5x)+(3x-15)=0 Making the group of two terms.
x(x - 5) + 3(x - 5) =0 Taking out the common factor from each terms.
(x - 5) (x + 3) =0 Taking out the common factor (x-5) from both the terms.
So, x - 5 =0 and x + 3 =0 Set up each factor equal to 0.
So, x=5 and x=-3.
Hence, the excluded values are 3) -3 and 5.
Its closer to 2 because 5 or more is the next bigger number when you are closer to rounding :)
Answer:
3
Step-by-step explanation:
You want the greatest of three consecutive odd integers that have a sum of 3.
<h3>Average</h3>
The average of the integers is their sum divided by their number:
average = 3/3 = 1
This is the value of the middle of the three integers, so they are ...
-1, 1, 3
The greatest of the three is 3.
Answer:
x=1
Step-by-step explanation:
4x+3=7
7-3 = 4
4x=4
4/4 = 1
Hope this helps! :)
