Question

SIMPLIFY (4-74+7) A. 223 B. 9 27 C. 9+2/7 D. 9

Answer 1

The correct option is D.

Explanation:

The given expression is

`(4-√(7))(4+√(7))`

Difference of two squares property:

`a^2-b^2=(a+b)(a-b)`

Using the above property, the given expression can be written as

`(4)^2-(√(7))^2`

Applying square we get

`16-7`

`9`

Therefore the correct option is D.