Question
Find three consecutive even integers such that twice the product of the first and last numbers is 28 more than the square of the second number.
I know the answers i just need to know how to get to them and ive spent 30 min on it HELP ME!!!!
I know the answers i just need to know how to get to them and ive spent 30 min on it HELP ME!!!!
Answers
bobpursley
let the integers be n, n+1, and n+2
2n*(n+2)-28=(n+1)^2
solve for n, notice it is a quadratic.
2n*(n+2)-28=(n+1)^2
solve for n, notice it is a quadratic.
Stupid
Buy why wouldn't it be n, n+2, and N+4 because it is even ingergers,
Not answered
this question is still not answered will some one walk through it step by step
Reiny
you are right, it should have been
n, n+2 and n+4 so let's adjust bobpursley's equation to look like
2n(n+4) - 28 = (n+2)^2
n, n+2 and n+4 so let's adjust bobpursley's equation to look like
2n(n+4) - 28 = (n+2)^2
Adithya
lets start with the equation
2n(n+4) - 28 = (n+2)^2
using formula (a+b)^2=a^2+2ab+b^2
2n^2+8n-28=n^2+4n+32
simplyfying,
n2+4n=32
Solving for n, we get n=4
So the even consecutive numbers are 4,6,and 8.....
checking...
2(4*8)-28=36
2n(n+4) - 28 = (n+2)^2
using formula (a+b)^2=a^2+2ab+b^2
2n^2+8n-28=n^2+4n+32
simplyfying,
n2+4n=32
Solving for n, we get n=4
So the even consecutive numbers are 4,6,and 8.....
checking...
2(4*8)-28=36