Answers by akash_kumar 9

If $3^{a}=4,4^{b}=5,5^{c}=6,6^{d}=7,7^{e}=8$ and $8^{f}=9$, then the value of the product $\mathrm{abcdef}$ is

The average of three distinct real numbers is $28$. If the smallest number is increased by $7$ and the largest number is reduced by $10$, the order of the numbers remains...

If $x$ and $y$ are positive real numbers such that $\log _{x}\left(x^{2}+12\right)=4$ and $3 \log _{y} x=1$, then $x+y$ equals$11$$20$$10$$68$

If $x$ and $y$ are real numbers such that $x^{2}+(x-2 y-1)^{2}=-4 y(x+y)$, then the value $x-2 y$ is$1$$2$$-1$$0$

For what value of $k,$ expression $x^{4} – 2x^{2} + k$ will be a perfect square ?$0$$1$$-1$Cannot be determined.