7/28 = 4/?
4*28 = 112. (a) = 16
112 ÷ 7 = 16.
7/588 = 4/?
4*588 =2,352. (b) = 336
2,352 ÷ 7 = 336
7/686 = 4/?
4*686 = 2,744. (c) = 392
2,744 ÷ 7 = 392
X= -2 and x= 2 are the answers
Hello from MrBillDoesMath!
Answer:
(1/8) ( 7 + sqrt(481) )
(1/8) ( 7 - sqrt(481) )
Discussion:
The equation is equivalent to 4x^2 - 7x -27 = 0 (as 3 + 24 = 0), Using the quadratic formula:
x = ( - (-7) +\- sqrt ((-7)^2- 4*4*(-27)) )/ (2*4)
= (1/8) ( 7 +\- sqrt(49+ 432) ) =
= (1/8) ( 7 +\- sqrt(481))
Regards,
MrB
The answer should be 9 if I’m not mistaken
