I'm having a bit of trouble with this one. Can anyone help me out?

Many thanks.

Q.Given that & that a & b are positive integers, find the value of a & b.

Attempt:=> => => => => => ...

Ans.:(From text book): a = 2, b = 5

Printable View

- June 26th 2012, 09:18 AMGrigOrig99Surds
I'm having a bit of trouble with this one. Can anyone help me out?

Many thanks.

**Q.**Given that & that a & b are positive integers, find the value of a & b.

**Attempt:**=> => => => => => ...

**Ans.:**(From text book): a = 2, b = 5 - June 26th 2012, 09:22 AMProve ItRe: Surds
- June 26th 2012, 09:29 AMPlatoRe: Surds
- June 26th 2012, 09:31 AMjohnnylam123Re: Surds
From above, then we let b, -a are root of a quadric equation s.t. -ab=-10, b+(-a)=3

ie, equation is x^2-3x-10=0

(x+2)(x-5)=0

then (a=2,b=5) or (a=5,b=2)

by putting to original equation, answer is found - June 26th 2012, 09:45 AMHallsofIvyRe: Surds
- June 26th 2012, 09:53 AMGrigOrig99Re: Surds
Great. Thanks guys.