Posted by **aldwin** on Tuesday, October 25, 2011 at 1:38am.

In 11 years, the age of Russel will be half of the square of the age he was 13 years ago. Find his present age.

- math -
**Anonymous**, Tuesday, October 25, 2011 at 3:12am
x + 11 = ( 1 / 2 ) ( x - 13 ) ^ 2

x + 11 = ( 1 / 2 ) ( x ^ 2 - 2 x *13 + 13 ^ 2 )

x + 11 = ( 1 / 2 ) ( x ^ 2 - 26 x + 169 )

1 / 2 ( x ^ 2 ) - 13 x - x + 169 / 2 - 11 = 0

( 1 / 2 ) x ^ 2 - 13 x - x + 169 / 2 - 22 / 2 = 0

( 1 / 2 ) x ^ 2 - 13 x - x + 147 / 2 = 0

The exact solutions are:

7

or

21

- math -
**Anonymous**, Tuesday, October 25, 2011 at 3:15am
In 11 years, the age of Russel will be half of the square of the age he was 13 YEARS AGO.

For that reason present age = 21

## Answer this Question

## Related Questions

- Mathematics - In 11 years, the age of Russel will be half of the square of the ...
- Mathematics-please help quick!! - Harry is twice as old as Doyle. Doyle's age is...
- algebra - the sum of the age of a girl and her brother is 26 year 3 years ago ...
- Algebra (Age Problem) - Five years ago Rico's age was half of the age he will be...
- Math - Application of Quadratic Equations. A girl's age in 12 years' time is the...
- math - A. A woman was 30 years old when her daughter was born.Her age is now 6 ...
- Math - How many years old is a person if her age now is equal to her age in 3 ...
- Math - The sum of John's age and twice of his son's age is 56. In 8 years time, ...
- Math - Sheila's age is two years more than twice Nicole's age. The sum of their ...
- Algebra - 4 years ago my father's age was 4 times that of my age. At present the...