Question

if x is real then maximum value of 3xsquare+9x+17/3xsquare+9x+7 is

Answer 1

Step-by-step explanation:

First of all, distribute the fraction.

(3x^2+9x+17)/(3x^2+9x+7) = 1 + 10/(3x^2+9x+7)

Now, for this sum to be Maximum, the fraction should be at its maximum value. For this to happen, the denominator of the fraction should be at its minimum. Consider the polynomial 3x^2+9x+7

Try to make the polynomial a Perfect Square. This way, it'll be easier to calculate its Minimum.

3x^2+9x+7 = [{(√3)x}^2 + 2*(√3)*{3(√3)/2}*x + 27/4] +(7 - 27/4)

This is nothing but, [(√3)x + 3*(√3)/2]^2 + 1/4.

This polynomial can have its minimum value as 1/4, because the Perfect Square can have its minimum value as 0, since x is Real.

Thus min value of polynomial is 1/4.

Hence total value(maximum) = 1+ 10/(1/4)

= 1+ 40 = 41

Answer 2

Step-by-step explanation:

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