Question

16. Simplify: (7 + V5)(7 – V5)​

Answer 1

Step 1:

→$(7 + \sqrt{5} )(7 – \sqrt{5} )$

open the brackets to simplify the expression

Step 2:

→$49 - 7 \sqrt{5} + 7 \sqrt{5} - 5$

Multiplication happened

Step 3:

→$49 - 5$

Subtraction happened

Step 4:

→$\blue{44✓}$

So finally we get 44

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Answer 2

Step-by-step explanation:

(7+v5)(7-v5)

7*2-v5*2

(by (a+b)(a-b)=a*2-b*2)

49-25v*2

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