SOLUTION: Solve this proportion: Solve for X: x-3/x = 4/7

Question 79495: Solve this proportion:
Solve for X:
x-3/x = 4/7
Answer by checkley75(3666) (Show Source): You can put this solution on YOUR website!
x-3/x=4/7
(x^2-3)/x=4/7
7x^2-21=4x
7x^2-4x-21=0
using the quadratic equation we get:
x=(4+-sqrt[-4^2-4*7*-21])/2*7
x=(4+-sqrt[16+588])/14
x=(4+-sqrt604)/14
x=(4+-24.5764)/14
x=(4+24.5764)/14
x=28.5764/14
x=2.04 answer.
x=(4-24.5764)/14
x=-1.47 answer.
RELATED QUESTIONS
Solve the proportion... (answered by jim_thompson5910)

solve this proportion for hte variable x+2/x+6 =... (answered by ewatrrr,rfer)

Solve the Proportion for x: 21/x =... (answered by oscargut)

Solve this proportion.... x-2 / 4 = x+4 /2 (answered by jim_thompson5910)

How can I solve the following proportion... (answered by josgarithmetic)

solve this proportion for the variable: x+2/x+6 = x-4/x-2 A) 7 B) -7 C) -10 D)... (answered by stanbon)

solve the proportion for x 15/x... (answered by ewatrrr,user_dude2008)

solve for x in the proportion:... (answered by rwm)

solve the proportion for x/3=... (answered by pie90010)