Question

Find the value of (969)2 – (968)2​

Answer 1

See answers ... using 2nd identity of algebra a^2-b^2=(a+b)(a-b). (969+968)(969-968).

Answer 2

Answer:

Let, P be the principal amount and r% be the rate of compound interest.

P*[{1 + (r / 100)}^2 - {1 + (r / 100)}] = 880 ……(I)

P*[{1 + (r / 100)}^3 - {1 + (r / 100)}^2] = 968 …(II)

(II) / (I) gives:

{1 + (r / 100)} = 1.1

(r / 100) = 0.1

r = 10

Rate of compound interest = 10%.