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Q.

What is the value of $(13 + 11) (11 − 13)$ after simplifying it?

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a

2

b

-2

c

4

d

5

answer is D.

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Detailed Solution

Given-

(13 + 11) (11 − 13)

We can simplify it as,

13 + 11 11 − 13 = 112 − 132 [∵ (a + b) (a − b) = a 2 − b 2] ⇒ 13 + 11 11 − 13 = 11 − 13 ⇒ 13 + 11 11 − 13 = − 2

Thus, the value of

(13 + 11) (11 − 13)

after simplifying it is

− 2

.
Hence, option 4 is the correct option.

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