# Thread: write an equation to represent infromation

1. ## write an equation to represent infromation

Jack is 5 years older than jill,the product of their ages is 500,
write an equation to represent this information (let x be jills age..so find x jills age)

2. Originally Posted by wolfhound
Jack is 5 years older than jill,the product of their ages is 500,
write an equation to represent this information (let x be jills age..so find x jills age)
$jill's \ age = x$
$Jack\ is\ 5\ years\ older\ than\ jill\ ,\ therefore\ jack'\ age = x+5$
$according\ to\ question\ ,\ product\ of \ their\ ages\ is\ 500$
$therefore\ \\ x \times (x+5) = 500$
$\ x^2+ 5x - 500 = 0$

but I still need to find what age jill is?

4. Originally Posted by wolfhound
but I still need to find what age jill is?
It's expected that you attempt to solve the equation you were given. If you can't, please show what you tried and say where you get stuck.

5. Originally Posted by mr fantastic
It's expected that you attempt to solve the equation you were given. If you can't, please show what you tried and say where you get stuck.
Hi,I can not get any further than the above... the thing is I have not learned how to do these sums..I would just like to get a head start..

I will show my attempts in future

6. Originally Posted by wolfhound
Hi,I can not get any further than the above... the thing is I have not learned how to do these sums..I would just like to get a head start..

I will show my attempts in future
Solving Quadratic Equations: Solving by Factoring

Do you know how to factorise?