Factoring by grouping usually pairs up the first 2 sets of expressions with the second 2 sets. Ours looks like this, then: 
. If we factor out the common x-squared in the first set of parenthesis, along with factoring out the common 5 in the second set, we get this: 
. Now the common expression that can be factored out is the (x-9). When we do that, here's what it looks like: 
. I'm not sure how far you are going with this. You could set each of those equal to 0 and solve for x in each case. The first one is easy. If x - 9 = 0, then x = 9. The second one involves the imaginary i since x^2 = -5. In that case, 
. Hopefully, in what I have given you, you can find what you're looking for.
The earth has a diameter of 7926.41 miles. what is the circumference of the earth?
1 answer:
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Answer:
Option B
Step-by-step explanation:
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we know that
<u>The vertical line test </u>is a visual way to determine if a curve is a function or not. A function can only have one value of y for each unique value of x
In this problem
The given function passes the vertical line test
therefore
f(x) is a function
<u>The Horizontal Line Test</u> is a test use to determine if a function is one-to-one
If a horizontal line intersects a function's graph more than once, then the function is not one-to-one.
In this problem
The given function fails the horizontal line test
because for f(x)=0 x=-3, x=-1, x=3
therefore
It is no a one-to-one function
