Nirmql 1 Question 0 Answers 0 Best Answers 20 Points View Profile 0 Nirmql Asked: February 7, 2020In: Class 9 Power and exponent 0 Ques.14. if 10 raised to power 2y = 25 then 10 raised to power -y =? class 9class 9mathsimportant questions class 10 mathsmathsmaths mcq Share Facebook 2 Answers Voted Oldest Recent Amit Sharma 15 Questions 80 Answers 16 Best Answers 657 Points View Profile Amit Sharma Added an answer on February 7, 2020 at 3:50 am (10)^2y = 25 So, [(10)^y]^2 = 25 and (10)^y = square root (25) = 5 Therefore, [10]^(-y) = 1/5 7 Reply Share Share Share on Facebook Share on Twitter Share on LinkedIn Share on WhatsApp Shivam Added an answer on February 8, 2020 at 4:22 pm 10^2y =10×10×y=100y 100y=25 Y=25÷100=14 10^-y=-10y^1×14 Y=-10×14=-0.25 0 Reply Share Share Share on Facebook Share on Twitter Share on LinkedIn Share on WhatsApp Leave an answerLeave an answerCancel reply Click on image to update the captcha. Save my name, email, and website in this browser for the next time I comment.

## Amit Sharma

(10)^2y = 25

So,

[(10)^y]^2 = 25

and

(10)^y = square root (25) = 5

Therefore,

[10]^(-y) = 1/5

10^2y =10×10×y=100y

100y=25

Y=25÷100=14

10^-y=-10y^1×14

Y=-10×14=-0.25