solve the proportion: 3/x=(x+7)/(5x+3)
a. x= -1and 9
b. x= 1 and 9
c. x= -1 and -9
d. x= 1 and -9

Question

solve the proportion: 3/x=(x+7)/(5x+3)
a. x= -1and 9
b. x= 1 and 9
c. x= -1 and -9
d. x= 1 and -9

anonymous · Answer

$$\frac{3}{x}=\frac{x+7}{5x+3}$$ solve 
$$3(5x+3)=x(x+7)$$

anonymous · Answer

you will get a quadratic equation which is why there are two solutions

anonymous · Answer

@satellite73  should i have gotten 15x +9 = x^2 +7x

anonymous · Answer

yes as a first step

anonymous · Answer

the set it equal to zero and solve by factoring
someone went to a lot of trouble to cook a problem up so that the quadratic would factor 
the least you can do is not solve using a real technique like the quadratic equation, just factor it