Question

What is the value of $k$, if $\sqrt{10k+3}=5$?

• A. $0.2$
• B. $2$
• C. $2.2$
• D. $2.8$
• E. $4.7$

Answer 1

Answer: (C)

$2.2$

Given,
$\sqrt{10k+3}=5$
$\Rightarrow {\left(\sqrt{10k+3}\right)}^2=5^2$ .....(Squaring both the sides)
$\Rightarrow 10k+3=25$
$\Rightarrow 10k=25-3$
$\Rightarrow k=\frac{22}{10}=2.2$