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loopysoop5035
18.02.2021 •
Mathematics
What are 10,293 miles in 602 and 603 days converted to the swimming speed in miles/day to and miles/hour?
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Ответ:
y = 2x + 1
Since the right side of both sides are equal to y, we can set them equal.
-x² + 4 = 2x + 1
Now that we just have one variable, we can solve easily.
Let's get everything on one side.
x² + 2x - 3 = 0
Let's solve this quadratic by factoring.
We want two numbers that multiply to -3 and add to 2.
These are 3 and -1. Let's split the middle.
x² - x + 3x - 3 = 0
Factor the first and last two terms...
x(x-1) + 3(x-1) = 0
(x+3)(x-1) = 0
And value of x which causes either factor to equal 0 is a solution.
We can derive these equations:
x+3=0 and x-1=0
Then solving for x...
x = -3 or 1