SOLUTION: Please help me solve this question : {{{Sqrt(24-10x)}}} = 3-4x, 3-4x > 0.

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Question 1088343: Please help me solve this question : Sqrt%2824-10x%29 = 3-4x, 3-4x > 0.
Answer by ikleyn(52778) About Me  (Show Source):
You can put this solution on YOUR website!
.
Please help me solve this question : Sqrt%2824-10x%29 = 3-4x, 3-4x > 0.
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1.  Square both sides to get

    24 - 10x = %283-4x%29%5E2

    24 - 10x = 9+-+24x+%2B+16x%5E2

    16x%5E2+-+14x+-+15 = 0

    (8x + 5)*(2x - 3) = 0

    The roots are x = -5%2F8 and x = 3%2F2.

    With  x = 3%2F2  the expression  (24-10x)  under the square root is negative and therefore does not work.

    The only working solution is  x = -5%2F8.


    See the plot below.

    



Plot y1 = sqrt%2824-10x%29 (red) and y2 = 3-4x (green)