Monday, May 28, 2012

The product of two numbers is 24 find the numbers if one number is two more than twice the other.

Let the numbers be x and
y


Given that the product is
24.


==> x*y =
24.............(1)


Now we know that one number is 2 more
than twice the other number.


==> x = 2y+ 2
..............(2)


We will substitute (2) into
(1).


==> (2y+2)*y =
24


==> 2y^2 + 2y =
24


We will divide by
2.


==> y^2 + y=
12


==> y^2 +y - 12 =
0


==> (y+4)(y-3) =
0


==> y1= -4  ==>  x1= 2*-4+2 =
-6


==> y2= 3  ==> x2= 2*3+2 =
8


Then we have two sets of
solution.


==> The numbers are 3 and
8   OR   -4 and -6.

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