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Robinlynn228
07.08.2021 •
Mathematics
Two joggers each run at their own constant speed and in opposite directions from each other around an oval track. They meet every 36 seconds. The first jogger completes one lap of the track in a time that, when measured in seconds, is a number (not necessarily an integer) between 80 and 100. The second jogger completes one lap in a time, t seconds, where t is a positive integer. What is the product of the smallest and largest possible values of t?
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Ответ:
x = 1, x = -![\frac{3}{2}](/tpl/images/0180/0093/dbf42.png)
Step-by-step explanation:
Given
2x² + x - 1 = 2 ( subtract 2 from both sides )
2x² + x - 3 = 0 ← in standard form
Consider the factors of the product of the coefficient of the x² term and the constant term which sum to give the coefficient of the x- term
product = 2 × - 3 = - 6 and sum = + 1
The factors are - 2 and + 3
Use these factors to split the x- term
2x² - 2x + 3x - 3 = 0 ( factor the first/second and third/fourth terms )
2x(x - 1) + 3(x - 1) = 0 ← factor out (x - 1) from each term
(x - 1)(2x + 3) = 0
Equate each factor to zero and solve for x ← zero product property
x - 1 = 0 ⇒ x = 1
2x + 3 = 0 ⇒ 2x = - 3 ⇒ x = -![\frac{3}{2}](/tpl/images/0180/0093/dbf42.png)