Question

what is the answer of (√5-1)×(√5+1)​

Answer 1

Answer:

heya mate ☺

$( \sqrt{5} - 1) \times ( \sqrt{5} + 1) \\ = ( \sqrt{5} ) ^{2} - (1) ^{2} \\ = 5 - 1 \\ = 4$

☞ Formula used :

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

hope it helps u mate ✌

Answer 2

Answer:

4

Step-by-step explanation:

(√5-1)×(√5+1)

√5×√5 + √5×1 - 1×√5 - 1×1

5+√5-√5-1

5-1=4