<PRE><B>Question 141938</B>
16000(1+r)^2 = 25000
:
Divide both sides by 16000
(1+r)^2 = {{{25000/16000}}}
(1+r)^2 = 1.5625
FOIL
1 + 2r + r^2 = 1.5625
:
r^2 + 2r + 1 - 1.5625 = 0
A quadratic equation:
r^2 + 2r - .5625 = 0
Solve this using the quadratic formula; a=1, b=2, c=-.5625
:
You will get two solutions: r = +.25, and r = -2.25</PRE>