krally0399
21.02.2020 •
Mathematics
What is the solution set of 2x2 - 3x= 5?
{-1, -5/2}
{-1,5/2}
{1, -5/2}
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Ответ:
{-1, 5/2}
Step-by-step explanation:
2x² - 3x = 5
2x² - 3x - 5 = 0
(2x - 5) (x + 1) = 0
2x - 5 = 0, therefore 2x = 5 and x = 5/2
x + 1 = 0, therefore x = -1
Ответ:
$14.40
Step-by-step explanation:
a. (18) (80%) = (18) (.80) = $14.40 is discount
b. (x)(.80)= discount price
c. 18/80% =$22.50 is regular price