Question

Evaluate it plz plz


(3 + √5) (5-√5)​

Answer 1

Step-by-step explanation:

Let √3 + √5 be a rational number , say r

then √3 + √5 = r

On squaring both sides, 

(√3 + √5)2  = r2 

3 + 2 √15 + 5 =  r2  

8 + 2 √15  = r2   

2 √15 =  r2  - 8 

√15 = (r2 - 8) / 2 

Now (r2 - 8) / 2 is a rational number and √15 is an irrational number . 

Since a rational number cannot be equal to an irrational number . Our assumption that √3 + √5 is rational wrong .

Answer 2

Answer:

(3+ √5)(5-√5)

= 3(5-√5)-√5(5-√5)

=15 + 3√5 - 5√5 - √25

pls mark brainliest