Posted by elisabeth on Monday, December 5, 2011 at 10:02am.
(a+bx)(c+dx)=income
solve for x

Math  bobpursley, Monday, December 5, 2011 at 10:08am
FOIL
ac+adx+bcx+ dbx^2=income
db x^2+ (ad+bc)x+ (acincome)=0
now, use the quadratic equation to solve for x. Without numerals, it is complicated.