Question

Please give me the correct answer

x + y = 5 and xy=6 then the value of x^3 -y^3 = ______.​

Answer 1

Step-by-step explanation:

Since the image is formed on the screen, if is real. Real object and real image implies concave mirror.

Applying m=ff−u or −2=ff−u (i)

After shifting, −3=ff−(u+5) (ii)

Here, care should be taken that distance of the object becomes u+5 not u−5: In a concave mirror the size of real image will increase only when the real object is brought closer to the mirror. In doing so, its x-coordinate will increase.

From (i) and (ii), we get

f=−30cm or R=60cm

hope this helps you