
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 =)

$\displaystyle 9h + 2(81 + h^2)= 230$
$\displaystyle 9h + 162 + 2h^2= 230$
$\displaystyle 2h^2 + 9h  68 = 0$
Now factorise or use the quadratic formula to solve for h.

thanks man, lol my brain just switched off today xD