Sophia runs twice as fast as her friend Mia. If mia runs 3 mph how long will it tske sophia to run 6 miles? 9 miles?
1 answer:
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Answer:
Or, in standard form:
Step-by-step explanation:
We can use the factored form of a quadratic equation:
Where a is the leading coefficient and p and q are the zeros of the quadratic.
We know that the x-intercepts are at (2, 0) and (-7, 0).
So, let's substitute 2 for p and -7 for q. This yields:
Now, we need to determine a.
We know that it passes through the point (1, 32). In other words, if we substitute 1 for x, we should get 32 for f(x). Therefore:
We can now solve for a. First, compute:
Multiply:
Divide both sides by -8:
So, the value of a is -4.
Therefore, our entire equation is:
Notes:
We can expand this into standard form: