4-2.Quadratic Equations and Inequations
normal

સમીકરણ $(\frac{3}{2})^x =  -x^2 + 5x-10$ ના વાસ્તવિક ઉકેલોની સંખ્યા .......... છે 

A

$1$

B

$2$

C

$4$

D

$0$

Solution

Let $f(x)=-x^{2}+5 x-10$ and $g(x)=\left(\frac{3}{2}\right)^{x}$

$f(x)_{\max }=\frac{-D}{4 a}=\frac{-15}{4}$ and $g(x)>0$

so $f(x)=g(x)$ has no Real solutions

Standard 11
Mathematics

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