First slide
Theory of equations
Question

 Number of integral values of x for which 8+2xx2>63x is true is 

Moderate
Solution

8+2xx2>63x We must have 8+2xx20

 x[2,4]-----(1) We must have 63x0

 x2-----(2) 8+2xx2>36+9x236x 5x219x+14<0 (5x14)(x1)<0 x1,145-----(3)

 by (i) and (ii) and (iii) x(1,4]

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