jerseygirl3467
13.11.2019 •
Mathematics
Which function has only one x-intercept at (−6, 0)?
f(x) = x(x − 6)
f(x) = (x − 6)(x − 6)
f(x) = (x + 6)(x − 6)
f(x) = (x + 6)(x + 6)
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Ответ:
Ответ:
Step-by-step explanation:
Let's find the roots of every function:
Expand the left side:
Using quadratic formula:
Therefore:
Hence, the first function has two roots:
Analizing the second function:
It's easy to see that it has a repeated root at x=6
Now, the third function:
Also, it's simple to conclude that it has two roots at x=6 and x=-6
Finally the fourth function:
has a repeated root at x=-6, which satisfies the problem condition
Aditionally I attached the graph of every function, so you will be able to check the result easily.
Ответ:
so
7*9 = 63
45/x=5/7
45/63=5/7 or x = 63