Question

Q31) Write the identities that can be used to find the following products, also use them to find
the products.
(a) (x + 5) (x - 5)
(b) 992​

Answer 1

Step-by-step explanation:

Solution:

Here, (√5 + √22 = (√52 + 2√5√2 + (√2)2

= 5 + 2√10 + 2 = 7 + 2√10

Solution:

Let x =1.8181… …(i)

100x = 181.8181… …(ii) [multiplying eqn. (i) by 100]

99x = 180 [subtracting (i) from (ii)]

x = 18099

Hence, 1.8181… = 18099 = 2011