Question

Simplify :(5+root2)(5-root2)

Answer 1

Answer:

23

Explanation:

(5 + $\sqrt{2}$) (5 - $\sqrt{2}$)

⇒      (5)² - ($\sqrt{2}$)²                                    [using identity (a+b)(a-b) = a²-b²]

⇒       25 - 2

⇒       23

Answer 2

23

Explanation:

given (5+√2) (5-√2)

by using the identity (a+b)(a-b)= a²-b²

= 5²-√2²

=25-2

=23

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Maths algebraic identities

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