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Translate into an algebraic equation and solve.  Find three consecutive odd integers such that the difference between four times the first integer and twice the largest integer is two. 

Guest Dec 17, 2014

Best Answer 

 #2
avatar+17744 
+5

CPhill is correct; a  slightly different approach is:

Consecutive odd integers are like:  3, 5, 7, 9, ...   (they are 2 apart from each other)

So, three consecutive odd integers can be:  x, x + 2, and x + 4

"four times the first integer"  --->  4·x

"twice the largest integer"     --->  2(x + 4)  =  2x + 8

"difference is two" means subtract and get an answer of two; so subtact the smallest from the largest and have that answer be two:  (2x + 8) - (4x)  =  2

--->                              2x + 8 - 4x  =  2

--->   simplify   --->               8 - 2x  = 2

--->   subtract 8   --->              -2x  =  -6

--->   divide by -2   --->              x  =  3      --->  x + 2  =  5      and     x + 4  =  7

geno3141  Dec 17, 2014
 #1
avatar+87309 
+5

Translate into an algebraic equation and solve.  Find three consecutive odd integers such that the difference between four times the first integer and twice the largest integer is two. 

Let the integers be 2n+ 1, 2n + 3 and 2n +5

So

4(2n + 1) - 2(2n + 5)  = 2    simplify

8n + 4  - 4n -10  = 2

4n - 6  = 2    add 6 to both sides

4n = 8     divide both sides by 4

n = 2

So....the first integer is 2(2)+ 1 = 5    and the last integer  is 2(2) + 5 = 9

 

CPhill  Dec 17, 2014
 #2
avatar+17744 
+5
Best Answer

CPhill is correct; a  slightly different approach is:

Consecutive odd integers are like:  3, 5, 7, 9, ...   (they are 2 apart from each other)

So, three consecutive odd integers can be:  x, x + 2, and x + 4

"four times the first integer"  --->  4·x

"twice the largest integer"     --->  2(x + 4)  =  2x + 8

"difference is two" means subtract and get an answer of two; so subtact the smallest from the largest and have that answer be two:  (2x + 8) - (4x)  =  2

--->                              2x + 8 - 4x  =  2

--->   simplify   --->               8 - 2x  = 2

--->   subtract 8   --->              -2x  =  -6

--->   divide by -2   --->              x  =  3      --->  x + 2  =  5      and     x + 4  =  7

geno3141  Dec 17, 2014
 #3
avatar+87309 
0

Thanks, geno.....yours "works," too!!!

 

CPhill  Dec 18, 2014

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