Question

multiply and do the answer briefly (√11 - √7) (√11 + √7​

Answer 1

Answer:

72

Step-by-step explanation:

(√x-√y)-(√x+√y)=x^2-y^2

Answer 2

$\bigstar$ Question:

• Multiply : (√11 - √7) (√11 + √7)

$\bigstar$To find:

• (√11 - √7) (√11 + √7) = ?

$\bigstar$ Solution:

(√11 - √7) (√11 + √7)

( By using ( a + b ) ( a - b ) = a² - b² )

= (√11)² - (√7)²

( Using (√a)² = a )

= 11 - 7

= 4

$\bigstar$Formula used:

• ( a + b ) ( a - b ) = a² - b²
• (√a)² = a