0 Nirmql Asked: February 7, 20202020-02-07T03:43:49+00:00 2020-02-07T03:43:49+00:00In: 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 2020-02-07T03:50:31+00:00Added 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 2020-02-08T16:22:49+00:00Added an answer on February 8, 2020 at 4:22 pm 10^2y =10×10×y=100y 100y=25 Y=25÷100=1\4 10^-y=-10y^1×1\4 Y=-10×1\4=-0.25 0 Reply Share Share Share on Facebook Share on Twitter Share on LinkedIn Share on WhatsApp Leave an answerLeave an answerCancel reply Featured image Select file Browse Click on image to update the captcha. Save my name, email, and website in this browser for the next time I comment.

(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=1\4

10^-y=-10y^1×1\4

Y=-10×1\4=-0.25