x(7-x)>8 A: 8 B: 0 C: 2 D: -1
Mathematics · High School · Tue Nov 03 2020
Answered on
Given the inequality:
x(7-x) > 8
Solution:
We must choose from the choices, in which in will satisfy the equation. To do so we substitute the given choice individually to the value of x.
8
8( 7 - 8) > 8
8 (-1) > 8
-8 > 8
False, since -8 is less than 8
0
0(7 - 8) > 8
0 > 8
False,since 0 is less than 8
2
2(7 - 2) > 8
2 (5) > 8
10 > 8
True, since 10 is greater than 8
-1
-1 ( 7 +1) >8
-8 > 8
False, since -8 is less than 8
Final answer:
C: 2