if you rewrite this, letting u = s+4, then you have
5u^2 - 44u - 9 = 0
(5u+1)(u-9) = 0
u = -1/5 or 9
Now, since u = s+4, s = u-4, so
s = -21/5 or 5
Find the real solution,
5(s+4)^2-44(s+4)=9
Thanks in advance
1 answer