Question

√11-√7)(√11+√7) is equal to:

a) -4 b) 4 c) 72 d) -72​

Answer 1

Answer:

4 is your correct answer.

Step-by-step explanation:

$\tt \huge \bigstar \red{ Formula} \bigstar$

$\tt \small \bold(a + b)(a - b) = {a}^{2} - {b}^{2}$

$\tt \huge \bigstar \red{ SOLUTION} \bigstar$

$\tt \small \bold(√11-√7)(√11+√7) = {( \sqrt{11} )}^{2} - {( \sqrt{7} )}^{2} \\ \\ \tt \small \bold \to11 - 7 = 4$

Answer 2

answer {√11-<√7) (<√11+√7)

(√11 -√7)²

11-7 = 4