For how many integer values of n will the value of the expression 4n + 7 be an integer greater than ...
For how many integer values of n will the value of the expression 4n + 7 be an integer greater than 1 and less than 40?
Answer/Solution
10
Steps/Work
4n+7 > 1
4n> -6
n > -(3/2)
n> -1.5 (n = -1, 0, 1 ,2 3........ upto infinity)
From second constraint
4n+7 < 40
4n< 33
n < 8. 25
n = (-infinity, .......-3, -2, -1, 0, 1, 2, .........upto 8)
Combining the two
-1.5 < n<8.25
n = 1 to 8 (48 integers)
and n = -1 and 0
so 10 integers.
A
4n> -6
n > -(3/2)
n> -1.5 (n = -1, 0, 1 ,2 3........ upto infinity)
From second constraint
4n+7 < 40
4n< 33
n < 8. 25
n = (-infinity, .......-3, -2, -1, 0, 1, 2, .........upto 8)
Combining the two
-1.5 < n<8.25
n = 1 to 8 (48 integers)
and n = -1 and 0
so 10 integers.
A