Quick algebra help

• October 19th 2010, 08:34 PM
token
Quick algebra help
i worked out the answer last night, but i need my working out and i forgot how i did it

this is a small part of the equation, and the last part i need to figure out how i worked out.

9h + 2(81 + h²)= 230

i already worked out that h= 4 but cant remember how so, and need to present working out.

help =)
• October 19th 2010, 08:39 PM
Educated
$9h + 2(81 + h^2)= 230$

$9h + 162 + 2h^2= 230$

$2h^2 + 9h - 68 = 0$

Now factorise or use the quadratic formula to solve for h.
• October 19th 2010, 08:42 PM
token
thanks man, lol my brain just switched off today xD