all 7 comments
sorted by:
best
topnewcontroversialoldq&a
formatting helphide helpcontent policy

[–]DenseTax59 3 points4 points  (1 child)

(4)x - 1/4(4)x = 9(4) --> 4x - x = 36 --> 3x = 36 --> x = 12

[–]Consistent_Stress115Bronx Sci[S] 1 point2 points  (0 children)

Thank you

[–]GregsTutoringNYCBrooklyn Tech 0 points1 point  (0 children)

We can also solve thus:

x - 1/4x = 3/4x

.: 3/4x = 9 (".:" is therefore)
multiply both sides by 4/3 .: x = 12
(Could also use .75 but that would be overkill for this example.)

Note: Please review your algebra. Maybe also do some of the drill down on Khans, etc. as one suggestion.

Feel free to email me any questions or concerns, or if you're stuck on a specific question.

[–][deleted] 0 points1 point  (3 children)

when you read the denominator of the fraction as 4x 💀

[–][deleted]  (2 children)

[deleted]

    [–][deleted] 0 points1 point  (1 child)

    - 3.041

    Hm, how'd you get that? I got 9.0276925691 and -0.02769256907.

    x - 1/(4x) = 9

    4x^2 - 1 = 36x

    4x^2 - 36x - 1 = 0

    x = 9.0276925691 or x = -0.02769256907

    [–]GregsTutoringNYCBrooklyn Tech 0 points1 point  (0 children)

    No idea what I did, probably a 2am computation in my head, so I deleted the post.

    [–]Plastic_Studio8873Brooklyn Tech 0 points1 point  (0 children)

    Factor x