If Janelle originally started 575
1 answer:
Given that Janelle travels at 65 mph. the number of more hours it will
take her to reach her destination is approximately 5 hours.
<h3>How can the time to reach her destination be calculated?</h3>Possible part of the question that appear missing are;
The distance Janelle drove in 4 hours = 260 miles
The distance from which she started = 575 miles
Required:
The number of extra hours it will take her to reach her destination
Solution:
The remaining distance = 575 miles - 260 miles = 315 miles
Which gives;
The time it takes Janelle to reach her destination ≈<u> 5 hours</u>
Learn more about average speed during motion here:
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To solve this equation , we need to write it in quadratic form
To get the equation in quadratic form we replace x^2 with u
can be written as
, Replace u for x^2
So equation becomes
Now we factor the left hand side
-16 and -1 are the two factors whose product is +16 and sum is -17
(u-16) (u-1) = 0
u -16 = 0 so u=16
u-1 =0 so u=1
WE assume u = x^2, Now we replace u with x^2
Now take square root on both sides , x= +4 and x=-4
Now take square root on both sides , x= +1 and x=-1
So zeros of the function are -4, -1, 1, 4